ࡱ> ~yz{|}q` 0rbjbjqPqP::V666J JE2$wh\6 86 6x o$ 0E;8;4x;6x(iX էEJJJČJJJJJJ Vaginal Microscopy I. Vaginal microscopy explained. A. The value. 1. Vaginal microscopy is an important laboratory tool for the differential diagnosis of vaginitis. It is also used to assess normal vaginal flora (Box 8-1). 2. It observes living vaginal organisms in order to study the ecology of the lower genital tract in women. 3. It is a direct, rapid, inexpensive test with high sensitivity and specificity for most conditions. 4. It acts as an accessory tool to the patient history, inspection of the vulvar and vaginal mucosa, and pH determination in order to arrive at a presumptive etiologic diagnosis. 5. The two components involved are saline wet mount and potassium hydroxide (KOH) wet mount. B. The wet mount. 1. Nomenclature. Microscopy involves use of the wet mount. a. Other similar terms include wet smear, wet prep, vaginal smear, vaginalysis, or hanging drop. 2. Basic principles. a. A 5-minute microscopic search is required before stating that a slide is negative. b. Examination under oil immersion is rarely needed. c. The sample should be taken from the vaginal side walls, the vaginal pool, or both; never from cervix. d. The sensitivity rate depends on the expertise of the clinician and the adequacy of equipment. e. Remember to consider cervical factors when working up studies of a patient complaining of vaginal discharge; if in the differential diagnosis phase, also perform a cervical wet mount. C. Indications. Should be performed 1. On every patient presenting with vaginal symptoms or with clinical features suggestive of a cervical or vaginal condition. 2. Even if the diagnosis is clinically obvious (such as with a curdlike discharge associated with candidiasis), because many conditions can mimic other conditions. 3. In a patient with a urine sediment that contains white cells and many squamous epithelial cells to determine the exact source of infection (vagina or urinary tract). The Five Conditions Causing the Majority of Vaginal Discharge or Infection (in Order) Bacterial vaginoses Candida vulvovaginitis Cervicitis (usually caused by Chlamydia) Excessive but normal secretions Trichomonas vaginitis 4. To determine the reason a routine Pap smear shows an inflammatory response. 5. As a follow-up test in a woman after treatment for a vaginal or cervical infection. 6. During the routine health maintenance visit to assess for normal flora or asymptomatic vaginal infection. 7. A thorough and comprehensive health history is necessary to establish a differential diagnosis (Box 8-2). Table 8-1 presents the differential diagnoses. II. Comments on the vaginal ecology. A. The vagina has minimal nerve endings; therefore, the symptoms of vaginal disorders may become evident only when the vaginal discharge bathes and irritates the sensitive vulvar skin. B. Normally, the vagina cleanses itself by the discharge of acidotic se cretions. C. The pH is acidotic, at 3.8 to 4.2. 1. Organisms live symbiotically in an acid environment. a. Factors that increase the glycogen content (high levels of estrogen in pregnancy or medication) increase the acidity of the vaginal secretions. b. Glycogen present in the epithelial cells is used by the peroxide-producing lactobacilli to produce lactic acid, which maintains an acid environment. c. Acidity allows for the overgrowth of the yeast organisms. 2. This level of acidotic secretions is antagonistic to harmful bacterial organisms. Factors affecting normal vaginal flora. 1. Role of hormones. a. Estrogen. (1) Affects vaginal epithelium. (2) Causes glycogen to be deposited in the vagina, mainly in the intermediate cells. (3) Glycogen is metabolized to become lactic acid. b. Progesterone causes shedding of these glycogen-rich cells into the vaginal pool. (This is the reason why symptoms of candidiasis increase premenstrually and are somewhat relieved after the menstrual flow.) 2. Effect of medications on the vaginal ecology. a. Antibiotics may increase the incidence of Candida infection. There are many theories: (1) Candida reproduce rapidly because they no longer have the competition from bacteria, which were destroyed by the antibiotic. (2) Secretion of an antifungal substance by bacteria stops when the bacteria are killed (more recent theory). (3) Possible direct stimulation of growth of Candida by the antibiotic. (4) Other theories describe reduction of host defenses, as in human immunodeficiency virus (HIV). b. Certain medications can affect the growth of lactobacilli and thus affect the vaginal milieu. (1) Some drugs, such as oral and vaginal metronidazole and ampicillin (modest), increase the number of lactobacilli. (2) Intravaginal clindamycin decreases the number of lactobacilli (very temporary, only lasts one week). (3) Drugs such as doxycycline, azithromycin, clotrimazole, and fluconazole have little or no effect. (4) Antifungals can reduce lactobacilluspossibly contributing to the problem of recurrence. c. Corticosteroids. (1) Reduce inflammatory response of host. (2) Topical steroids do not aggravate candidiasis, as previously thought. 3. Douching. Decreases normal flora, and increases the risk of bacterial vaginoses. 4. Tampon use may also alter normal flora and increase the risk of vulvovaginal infection. 3. The position of the condenser. a. For the low-power objective, need to drop the condenser for lower intensity setting. b. For the high-power objective, need to increase for higher intensity setting. C. Mechanics of observing the saline smear. (Always wear gloves.) 1. Position the slide on the stage of the microscope with saline preparation under the objective, and secure with stage clips. 2. Turn light on under stage. 3. Click low objective into place over the specimenobtains a larger view of the slide area, although the images are small. 4. Turn the condenser to the lowest position; subdued light is best to accentuate fine details. (Try increasing the light by raising the condenser while viewing the specimen to see how the cells and bacteria disappear from view.) 5. Move objective and slide as close together as possible, until just barely touching. 6. Adjust the eyepiece until a single round field is seen. 7. While looking through eyepiece, turn the coarse adjustment knob in opposite direction until the microscopic field comes into focus. Use both eyes. 8. Turn fine adjust knob back and forth to adjust to the different planes, and bring image into sharper focus. 9. Adjust each eyepiece separately by closing one eye at a time. 10. Turn knob slowly to focus (some microscopes are very sensitive; turning too rapidly may result in missing the proper plane of visualization). 11. Move the saline specimen under the objective, and scan the slide at low magnification to locate representative sections. a. Need to scan all fields because characteristic findings may be clumped in one section of the slide. b. When the side of the coverslip is reached, move the slide over one fields width, then start scanning in the opposite direction. 12. Switch to high-power objective (40X). a. Facilitates identification of microbes by further magnifying the specimen. b. It may be necessary to increase the light source slightly. c. Note: Watch stage when switching to make sure that the objective does not break the slide. This should not happen if low power is properly adjusted. 13. Turn fine adjustment back and forth; coarse adjustment should not need to be readjusted. 14. Using the stage adjustment knobs, move the slide laterally up and down and back and forth to view all fields because pathogens may not be distributed evenly throughout the slide and may be found in a limited number of fields. 15. Scan the slide systematically to evaluate the specimen fully. 16. Move the slide until you have a general impression of the number of squamous cells and any other findings. 17. Evaluate at least 12 fields. 18. Hint: If you immediately see one of the organisms that cause vaginitis you still must continue to examine the specimen in order to prevent missing a concomitant infection. D. Mechanics of observing the potassium hydroxide (KOH) preparation. Observe same principles of microscopy described earlier. 1. Move the KOH slide into position on stage. 2. Switch back to 10X objective to scan fields. 3. If yeast forms are noted, switch to high power to confirm their presence and type. E. Concluding comments. 1. Thorough observation of both preparations should take at least 3 to 5 minutes. 2. Remember to turn off the light source and dispose of the slide in a special biohazard container. 3. Clean the microscope stage if it is soiled, and clean the lenses with special paper. a. KOH can ruin the objective. Need to clean thoroughly. 4. Record findings, and review the findings with the patient. IV. Preparation for the wet mount procedure. A. Patient preparation. Any substance in the vagina can alter the accuracy of the microscopic findings. Instruct the woman in the following preparations: 3. Explain that the examination is similar to a Papanicolaou (Pap) smear and should not cause any discomfort. 4. Menses cannot be avoided if a woman happens to be symptomatic during that time of the month. However, it does make evaluation more difficult because of the presence of red blood cells in the smear. 1. Avoid coitus or douching for 24 hours before the examination. 2. Do not use over-the-counter preparations before the examination (avoid for as long as possible). B. Perform clinical evaluation. (See Box 8-3 for the sequence of the examination.) C. Observe characteristic of vaginal discharge (Table 8-2). D. Equipment. 1. Gloves. 2. Speculum (metal or plastic). 3. Wooden handled cotton-tipped applicators or a wooden spatula, or both. Sequence of Examination During an Infection Check Perform a careful history Review procedure and expected outcomes with patient Insert speculum Inspect genitalia, noting signs of infection Determine vaginal pH pH should be collected first because cervical specimens may cause cervical bleeding, which might raise the pH Procure sample of discharge Collect cervical culture or vaginal culture if indicated Remove speculum Label any specimens Perform wet mount evaluation Document results Review results with patient Treat any infection V. Saline wet mount. A. Obtaining and preparing the sample. 1. Obtain copious sample from the posterior and lateral vaginal walls using a wooden spatula or cotton-tipped applicator. a. The collection technique may vary with the suspected diagnosis. 2. Place two separate samples of vaginal discharge on the same unfrosted glass slide. It takes practice to use only one slide, but it is both time and cost effective, so it is probably worthwhile to develop the skill. (Saline sample should be thin.) a. Alternate procedure: Double slide method. (1) May use two separate slides, placed in double cardboard container (Fig. S-2A). (2) Place smear of sample on one slide, and a sample on the second slide (Fig. 8-2B). Add coverslip (Fig. 8-2C). (3) This method had the advantage of eliminating the possibility of the two solutions contaminating each other. 3. Add one drop of normal saline to thinner sample, and one drop of KOH to thicker sample. FIGURE 8-2 Preparation of wet mount of vaginal discharge for microscopic examination. (A) Using a cotton-tipped applicator or Pap stick, drops of the vaginal discharge are placed on two separate glass slides and spread thinly. (B) One drop of normal saline is added to one specimen for microscopic examination for Trichomonas vaginalis. One drop of 10%-20% potassium hydroxide (KOH) is added to the other specimen for microscopic examination for Candida albicans. (C) Separate coverslips are placed over each specimen. Slides are examined under high-and low-power lenses of microscope. a. Be careful not to mix the solutions. (1) If the solutions are mixed, the sample will have to be collected again because the KOH will dissolve the cellular material on the saline portion of the slide. b. Mix each specimen, thoroughly stirring until smooth, to cre ate a turbid suspension. (Use separate utensils.) (1) May use a wooden spatula or the opposite wooden end of a cotton-tipped applicator. (2) The saline specimen should be fairly dilute in order to separate the epithelial cells from each other. (3) If they are clumped on top of each other, the characteristic of the individual form is difficult to determine and sensitivity is reduced. c. Alternate method. Saline immersion. (1) Some believe that an undiluted smear is often far too thick to interpret accurately and dries too quickly. (2) Place 7 to 10 drops (0.5 ml) of physiologic saline in a small test tube. (Saline must be room temperature or warmer.) (3) Roll a cotton-tipped applicator along the posterolateral vaginal walls. (4) Immediately immerse applicator into the saline-filled tube. (5) Place a drop of the suspension on the slide using either method described earlier. d. Some comments. (1) It is controversial whether the dilutional effect of this method affects the sensitivity of this test. (2) It may prevent drying of the specimen (therefore, the examiner may have more time15 minutesto read slide). (3) This procedure may best be reserved for those examinations when trichomoniasis is suspected in order to ensure the motility of the organism, or when the examination does not allow the clinician to leave the room immediately. (4) Because the KOH cannot be prepared in similar fashion, it is more time consuming to prepare the slides two different ways. 4. Immediately place separate coverslips over each specimen just before viewing to prevent drying. a. Hold one edge of the coverslip against the side, and slowly drop (like a hinged door) over the liquid specimen in order to reduce the number of air bubbles. 5. Place a paper towel over entire slide, and lightly blot up any excess fluid. a. Helps keep the microscope clean. b. The pressure of the blotting stabilizes the mixture under the coverslip. 6. Interpret findings immediately, viewing saline slide first (allowing KOH time to lyse). 7. At least 12 fields should be analyzed for a total of 3 to 5 minutes. B. Findings on saline wet mount. 1. Vaginal epithelial cells. a. Slightly grainy cytoplasm-containing vacuoles. b. Distinct cell walls. c. Evaluate cells for the following features: (1) Quantity of mature cells present. (2) Presence of immature cells and their relative frequency (Fig. 8-3). May indicate Decreased estrogen. Significant inflammatory reaction of chronic inflammation.  FIGURE 8-3 Maturation of vaginal epithelical cells. Superficial and intermediate cells are considered mature. Parabasal and basal cells are considered immature. If manyindicates a severe inflammatory process of significant duration. d. Epithelial cells change throughout the menstrual cycle (Table 8-3). 2. Presence of significant bacterial adherence to cell surfaces. a. Often indicative of a virulent organism. b. Dynamic process involving bacterial fimbriae and epithelial surface characteristic. c. Attachment depends on pH, hydrophobic properties, and surface secretion. TABLE 8-3 Characteristics of Epithelial Cells in Relation to Menstrual CycleEarly proliferative phase Few cells found in smear because desquamation is slightPrecornifiedPolygonal shapeLittle tendency toward folding of the edgesTransparent cytoplasmNucleus with granular chromatinPMNs presentLate proliferative phaseUnder estrogenic stimulationSmall deeply pigmented, homogeneous nucleiPolygonal shapeMay appear flat or foldedRare PMNsMidsecretory phaseProgestational phaseIncrease in number of desquamated superficial cellsPredominately precornifiedMore angular with folded edgesNuclei are vesicular and elongated or ovalCytoplasm contains occasional granulesMarked tendency towards folding and clumpingBackground clearFew PMNsLate secretory (premenstrual) phaseClusters of desquamated, precornified cells Fragments of cytoplasm, mucus, and PMNs Peak sheddingPMN, polymorphonuclear cells.FIGURE 8-4 Lactobacilli. 3. Lactobacilli (Fig. 8-4). a. Easily visualized in saline preparation. b. Pleomorphic, gram-positive, aerobic or facultative anaerobic, non-spore-forming organism. c. Elongated rod-shaped bacilli that appear as straight rods, which may be slightly motile if smear is made properly and not excessively dried out. d. Lactobacilli vary in length between 5 and 15 (m. (1) Super-long bacilli may be a normal finding (previously termed Leptothrix); they may be longer than the diameter of an epithelial cell. (2) May indicate lactobacillosis (see p. 187). e. Lactobacilli usually dominate the flora of the normal estrogenized vagina (96%). f. Predominance in vagina of acidophilic lactobacillus species. (1) Eighty species have been identified. g. Maintains a low pH of vaginal discharge by making lactic acid, which inhibits adherence of bacteria to epithelial cells. h. Known to inhibit growth of organisms that may normally be found in the vagina such as (1) Gardnerella vaginalis. (2) Mycoplasma hominis. (3) Certain anaerobes. i. Little effect on candidiasis (may even increase) or trichomoniasis. j. Numbers increase following menarche, and markedly decrease following menopause. 4. White blood cells (leukocytes). a. Present as dark and granular cells with clearly segmented nuclei. (1). Termed polymorphonuclear (PMN). (2). This lobulated nucleus is often fairly easy to distinguish. d. May also appear as cytoplasmic granules with an indistinct nucleus (often with chronic infection). c. Slightly larger than the nucleus of a mature epithelial cell. d. Immobile trichomonal organisms are more like a teardrop in shape and slightly larger than mobile organisms, but they may be difficult to distinguish from PMNs. f. Help diagnose extent of inflammation (Table 8-4). g. Increased in many conditions (Box 8-4). 5. Motile trichomonads (see p. 182). 6. Clue cells (see p. 180). 7. False clue cells (see p. 186). 8. Immature squamous epithelial cells (see Ch. 13). Eosinophils may indicate an allergic response. Mobiluncus. a. Easily visualized; be careful not to confuse with the rod-shaped lactobacilli. b. Comma-shaped, highly motile bacteria. c. Seen at one point as black dots which bounce off the coverslip and elongate in eyelash shape. d. Gram stain is negative. 11. Red blood cellsvisible as small concave spheres. TABLE 8-4 Significance of White Blood CellsNumber in hpfRatio of WBC to epithelial cellNormal0-4<1:1Mild5-10>1:1 to 5:1Moderate10-205:1 to 10:1Severe>20 WBC/hpf>10:1 to TNTChpf, high-power field; TNTC, too numerous to count. Note: May be influenced by the concentration of the smear. If inflammation is present, observe for the presence or absence of parabasal cells.BOX 8-4 Causes of the Presence of Leukocytes (White Blood Cells) on Wet Mount Moderate increase of leukocytes found with IUD use Postpartum reparative process Atrophic vaginitis Allergic reaction to spermicides and douches (may also see eosinophils) Depo-Provera users with low estrogen levels Marked increase of leukocytes found with Trichomoniasis Candidiasis Chlamydia or gonorrhea Atrophic vaginitis with bacterial superinfection Hint: If many leukocytes are seen but neither Candida nor Trichomonas are present, consider a cervical culture for infections such as chlamydia or gonorrhea. Must also consider dysplasia or metaplasia as a possible cause. C. Normal findings include 1. Absence of or <5 white blood cells (WBC)/high-power field (hpf). 2. pH of <4.5. 3. Presence of moderate amounts of lactobacilli. 4. Absence of demonstrable pathogens such as Trichomonas or cocci. 5. Figure 8-5A demonstrates the characteristics of a normal smear. FIGURE 8-5 Normal flora. D. Hints on how to interpret a saline smear. 1. Evaluate systematically (like an electrocardiogrameach part is looked at; for example, QRS complex rather than the whole rhythm strip). 2. Picture the smear as an ocean (fluid medium) dotted with islands (vaginal epithelial cells) and boats or rafts that may be in the ocean or dotting the shores of the island. a. The boats can come in many sizes and shapes, and they may represent leukocytes or trichomoniasis, with smaller rafts representing cocci and rods. 3. Ask yourself the following questions: a. Are there any islands? How many in each field? What do they look like? Are the edges clear or obscured? If they are obscured, are they obscured by dots or rods? b. What is in the ocean surrounding the islands? Are there rods or cocci, or a mixture of both? Adequate numbers? Too few? Too many? c. Is there anything swimming in the ocean (extracellular spaces)? Are there any motile trichomonads or mobiluncus? d. Any leukocytes? How many? VI. KOH. A. Some comments. 1. Dissolves leukocytes, Trichomonas, and background debris, making identification of fungal structures easier. 2. Effects on epithelial cells. a. Breaks down cell wall, changing them from cuboid and trans lucent to ovoid and transparent. b. Become enlarged and faint; called ghost cells, a mere shadow of their former selves. 3. Branching and budding hyphae are alkali resistant and stand out in sharp contrast. 4. Higher sensitivity for Candida in KOH than in saline preparations. a. However, some sources believe that KOH is rarely necessary if the observer is skilled in the evaluation of saline preparations. B. Obtaining and preparing the sample. 1. Use cotton-tipped applicator or wooden spatula to collect specimen from vaginal walls. a. Cotton may contaminate the sample with fiber artifact. b. If vulvar sample, use wooden spatula to scrape erythematous border. 2. Dot onto slide. a. Material should be fairly thick with epithelial cells clustered to concentrate the yeast forms. b. This is in contrast to saline, in which the sample should be relatively thin. 3. Add a drop of KOH (10%). a. Be careful not to mix with saline solution if a single slide is used for both preparations. b. Use solution mixed by the laboratorys own pharmacy or order a premixed bottle. 4. Mix with the wooden end of a cotton swab or spatula to create a turbid mixture. 5. Perform the whiff test. a. Volatile amines are released into the air when anaerobic bacterial overgrowth comes in contact with an alkaline solution such as KOH. b. Amines are produced by converting lysine to cadaverine, arginine to putrescine, and trimethylamin oxide to trimethylamine. c. Immediately after mixing sample with KOH, smell the applicator (no need to bring entire slide to nose). d. Note the presence of a foul or fishy odor. e. If odor is present, it is recorded as a positive result. A positive result indicates an imbalance of the vaginal flora in which anaerobes dominate. f. Usually indicates the presence of bacterial vaginoses but may also indicate the presence of trichomoniasis. g. May not be positive in the presence of concomitant candidiasis. 6. Blot any excess fluid with paper towel. a. KOH can damage the objective. 7. If a vulvar sample is obtained, need to heat it slightly by passing it under a lighted match in order to dissolve the keratin. C. Findings on KOH wet mount. 1. Wait 2 to 3 minutes, allowing time for the KOH to dissolve the cellular structures. a. Its a good idea to examine the saline mixture during this time. 2. Scan slide. a. Low power. 10 Xlocate sections of yeast forms, which may appear as thin sticks. b. High power. 40 Xzero-in on buds and pseudohyphae for further confirmation of morphologic characteristics. 3. Artifact may interfere with interpretation of the wet mount (Box 8-5). 4. Note the presence of any yeast forms (see Table 8-8). D. For summary flow sheet instructions, see Table 8-5. TABLE 8-5 Vaginal Microscopy: Flow Sheet Instructions*DateHistoryBrief history of symptoms including self-care, medicationsLMP, last coitusLast menstrual period, last coitus, dyspareuniaVulva, vagina, cervixErythema, lesions, tendernessVaginal mucusAmount and characteristicsCervical mucusColor, quality, and amountpH (4.0-7.5) (4 = normal)Use 1-inch strip of Nitrazine or ColorpHast paper; dip pH paper into vaginal mucus collected on wooden spatula or from speculumAmine test (KOH)Using wooden spatula containing sample, stir X10 into 20% KOH on glass slideWet mount saline (dilute w/scattered ECs)Using wooden spatula containing sample, stir X 3 into saline solution on glass slideLow power (quality) X10 magnificationGeneral appearance and quality of sample, for example, proper concentration, too dilute, too concentratedHigh power (detail) X40 magnificationIdentify organisms and morphologyLactobacilli (0-5 + ) appear as rods1-2+ = few 3-4+ = dominant 5+ = false clue cellsBacteriaanaerobes (0-5 + ) appear as tiny dots1-2+ = few 3-4+ = dominant background 5+ = clue cellsWBCs (0-3 + ) lobulated nucleus1 + = 1:1 ratio to epithelial cells 2+ = 5:1 ratio to epithelial cells 3+ = 10:1 or greater ratio to epithelial cellsOtherEpithelial cells (true clue cells, false clue cells, grainy, furry) yeast, trich, mobiluncus, sperm, red blood cells, medications, artifactWet mount (KOH) (very concentrated)Epithelial cells look like round, faint balloons called ghost cellsLow powerHyphae forms (cobwebs) visible but not budsHigh powerHyphaelook like elongated circus balloons Budsspherical glass beadsAssessmentSpecify including rule outs, list in order of most likely to least likelyPlanDiagnostic tests including yeast cultures, meds, education, and follow-up*Adapted from Secor Scale. TABLE 8-5 Vaginal Microscopy: Secor Flow SheetDateHPILMP, last coitusVulva, vagina, cervixVaginal mucusCervical mucuspH (4.0-7.5) 4 = normalAmine test (KOH)Wet mount (saline)Low power (quality)High power (detail)LB (0-5 + )Bacteria (0-5 + )WBCs (0-3 + )OtherWet mount (KOH)Low powerHigh powerAssessmentPlanBOX 8-5 Artifacts That May Interfere With the Interpretation of Candida Species on Wet Mount In identification of spores White blood cells Nuclei of epithelial cells (particularly if clumped together) Powder granules from gloves (resemble umbilicated marshmallows) Tiny bubbles of emulsified vaginal creams (must elicit possibility of presence by history) Dust on microscope lenses In identification of filaments Cotton fiber from cotton-tipped swab, undergarments, or tampons Edges of epithelial cells rolled under the coverslip Scratches on slides or coverslips Edge of glass slide or frosted portion of the slide Note: KOH may lyse many forms seen on KOH making identification more accurate VII. The pH. A. Some comments about pH. 1. pH is representative of the acidity or alkalinity of the vagina as determined by the presence of lactobacilli and other organisms. 2. Exacerbation or amelioration of clinical disease in relation to the menstrual cycle is a function pH. 3. Need to correlate pH findings with microscopic examination and clinical assessment. 4. Evaluation of pH of the vaginal secretions is a valuable diagnostic tool. 5. It is easy to perform and is inexpensive, with a high predictive value. 6. Women must avoid intravaginal medication and sexual activity 2 to 3 days before the visit. 7. pH of the vagina varies with the amount of vaginal estrogen during the various reproductive cycles of women (Table 8-6). B. pH paper. 1. Scale must begin at 4.0 at minimum. TABLE 8-6 pH in Relation to Lifecycle Changes Affected By the Presence or Absence of LactobacilliPhase of Reproductive LifecyclepHPreadolescence7.0Reproductive years3.8-4.2 (<4.5)Postmenopausal years6.5-72. Record range of pH as determined by the color of the tape, compared with the manufacturers chart. C. Collection. Cut off strip before inserting speculum. 1. Use 1-inch strip of pH paper. 2. It is best to collect the sample from the upper lateral wall because it is less likely to be mixed with cervical mucus. 3. Obtain sample directly from tape applied to vaginal wall or to discharge from the collecting spatula, or dip tape into discharge pooled on the upper blade of the vaginal speculum. a. Keep the speculum in the sink in the event that additional samples are needed. (1) Avoids woman having to repeat the pelvic examination. D. Interpretation of results. 1. Acidic finding (below 4.5) indicates the presence of vaginal lacto-bacilli in the vaginal flora. 2. A pH of less than 4.5 effectively excludes a. Neisseria gonorrhoeae. b. Gardnerella vaginalis. C. Haemophilus influenzae. d. Trichomonas vaginalis. 3. T. vaginalis thrives on an alkaline milieu; Candida is inhibited. 4. Factors that interfere with the determination of pH, which, if present, eliminates use of pH as a diagnostic tool. a. Menses7.2. b. Semen>7. c. Mucusalkaline (cervical and vaginal). d. Lubricant from speculum. e. Intra vaginal medications. f. Lubricating jelly. g. Tap water. E. Summary of findings (Table 8-7). TABLE 8-7 Measurement of Vaginal PhpHConditionColor Change4.0-4.7Normal flora Cytolytic vaginosis Small number of immotile trichomonands may be present (not clinically significant)Light yellow4.0-4.7Vulvovaginal candidiasis (not as diagnostic) Group A or B beta hemolytic strepMedium to dark yellow4.7-6.0Bacterial vaginosisLight to dark olive green>6.0Trichomoniaisis Significant inflammation (i.e., chlamydia)Bluish hueVIII. Candidiasis explained. A. The Candida species. 1. Over 200 different strains of Candida species. 2. Fungi share characteristics of both plants and animals but are classified into their own kingdom. 3. They reproduce sexually by producing spores and asexually by budding. 4. Their growth is best supported in an environment that is warm, moist, and dark. 5. They rely on sugar as their major source of energy (glycogen in the female vagina). 6. Differentiation of terms: Yeast, fungus, mycoses, monilia, Candida are used interchangeably. 7. Candidiasis is not considered to be a sexually transmitted disease. B. Six genera most typically inhabit the vagina (in order of occurrence). 1. Candida albicans (in 65% of cases, this is the cause of vulvovaginal candidiasis). a. They are dimorphic. They form both blastospores and mycelia (filaments, hyphae, and pseudohyphae). b. Sometimes referred to as spaghetti and meatballs. 2. Candida tropicalis (23%). Dimorphic. 3. Candida glabrata (previously called Candida torulopsis), 5% to 10%. Monomorphic. Forms only spores (buds). 4. Candida krusei. 5. Candida parapsilosis. 6. Candida pseudotropicalis. C. Relationship to estrogen. 1. There is some evidence that there are estrogen receptors on C. albicans and that any condition that increases estrogen may increase risk of developing candidiasis, such as a. Pregnancy. b. Estrogen replacement therapy, either systemic or vaginal. c. Birth control pills. (New, lower dose pills dont seem to be as much of a problem.) D. Relationship to pH. 1. Presence does usually not change the acidity of the vaginal secretions. E. Predisposing factors for the development of candidiasis. 1. Resistance altered by immune status of the body. a. HIV. b. Pregnancy, corticosteroids, and stress may lead to depressed immunity. BOX 8-6 Substances That May Cause Chemical Vaginitis Substances associated with laundering Chlorine bleach Laundry detergent Fabric softeners Intravaginal preparations Propylene glycol found in spermicides, lubricants, and vaginal medications Feminine hygiene products Deodorant tampons, liners, and sanitary napkins Douches and vaginal sprays Body secretions Semen Saliva Vulvar or vaginal medications Antifungals Lidocaine Crotamiton Estrogen creams and suppositories Antibiotic preparations Clothing Fabric dyes, especially in colored underwear Nylon (can give off formaldehyde vapors) Fiberglass particles on underwear (residual in washing machine after washing fiber-glass materials such as curtains) Formalin, found in the wool of permanent press fabrics Bromine and chlorine compounds in hot tubs and swimming pools 2. Vaginal allergens cause a chemical vaginitis (Box 8-6). 3. Increased vaginal glycogen from sugar sources such as artificial sweeteners, wine, fruit juices, and processed sugar. F. Clinical features of C. albicans. 1. Subjective findings. a. Inflammatory response on the walls of the vagina. b. Produce erythema, edema, intense pruritus, pain, and dyspareunia. (1) Reactive increase in the production of polymorphonuclear leukocytes. (2) Symptoms exacerbate premenstrually but improve with the onset of menses. c. Clump like cottage cheese on undergarments. d. Adherence to cells is necessary for symptomatic disease. (1). C. albicans adheres more than other species. (2). This characteristic may explain why this species is more frequently found. 2. Objective findings. a. Invasion of C. albicans causes increased shedding, which leads ultimately to the thick curdlike discharge (sample for wet mount is best if taken from that discharge). (1) Variable; present 20% to 50% of the time. (2) Loosely adherent to the vagina or vestibule. (3) White or yellow in color. (4) May coat entire vagina or stick like patches of a rolled-up piece of tissue paper. (5) Will scrape off with a spatula. b. External dysuria (burning when the urine touches the vulva). c. Excoriation from scratching of affected tissues. Minimal odor. G. Diagnosis. 1. Use of vaginal microscopy in the diagnosis of candidiasis is 80% sensitive. 2. Yeast forms seen more easily with KOH preparation than with saline. 3. Wooden spatula best to obtain sample because use of a cotton swab may create a fiber artifact, leading to an incorrect diagnosis. 4. Observations using saline. a. Presence of varying numbers of leukocytes (PMNs). (1) Help determine the extent of inflammation. (2) Number increases with inflammation. b. Lactobacilli are present in moderate numbers. c. Negative whiff test. d. Possible concomitant infection. (1) Rare. (2) Determine if pH is increased. e. Presence of yeast forms. (1) Tinea cruris may have only hyphae. f. Abundance of epithelial cells (increase in exfoliation). (1) Many clumps are only sheets of sloughed squamous epithelium. (2) Carefully examine edges of these sheets for protruding Candida pseudohyphae. FIGURE 8-6 Candida albicans. 5. Observations using KOH (Fig. 8-6). a. Blanches cell wall transparent, making yeast forms more apparent. b. The examiner may warm slide slightly to enhance the lysing process. c. Note the presence of yeast forms (other yeast forms are de scribed in Table 8-8). TABLE 8-8 Candidal Forms in Relation to SpeciesYeast FormDescriptionSpecies NamePseodohyphaeLong segmented sausagesCandida albicans orHyphaeLong continuous filamentsC. tropicalisChlamydiasporesClusters of glass beads at terminal ends of the hyphae Uniform in size, associated with hyphae formsC. albicansBlastosporesBudding ovoid spores of variable size 2-8 microns Round to ovoid; no filamentsC. glabrataMay be budding or grouped in clusters interspersed with filaments Smaller than red blood cells Located at the proximal branches, appearing much like a fern Tiny glass beadsC. tropicalisH. pH <4.5 unless concomitant bacterial vaginosis is present. I. Cultures. 1. They are usually unnecessary because wet mount is often diagnostic. 2. They are expensive and may cause a delay in treatment. 3. They may be indicated if the diagnosis is suspected but no yeast forms are seen on wet mount. 4. More sensitive than wet mount but may confuse diagnosis. a. Candida may be part of normal vaginal flora. b. A positive culture does not indicate the presence of infection. c. The culture may be positive in up to 20% of women not infected with Candida. 5. Nickerson culture. a. Standard medium for Candida growth. b. Most sensitive. J. Gram stain may be positive when wet mount is negative due to excessive cellular debris. K. Pap smear. 1. Sensitivity is 50%. 2. Not routinely used as a diagnostic tool. 3. Asymptomatic Candida infection may be picked up on a routine smear. 4. A Pap smear should not be performed when Candida infection is suspected because presence of an inflammatory process will alter results. IX. Bacterial vaginosis explained. A. Description of terms. 1. osis means in excess of; it is means inflammation of. 2. Previously referred to over the years as haemophilus vaginitis, cornybacterium vaginitis, Gardnerella, nonspecific vaginitis, anaerobic vaginosis, bacterial vaginosisnow, vaginal bacteriosis is being used more frequently. 3. The term is defined as vaginal excess of bacteria, with little or no inflammation. B. Some comments. 1. It is the most common cause of vaginal complaints, occurring twice as frequently as candidiasis. 2. It is a surface parasite and does not usually invade vaginal tissues or cause an inflammatory reaction. 3. It is the most symptomatically benign of the common infections. a. It may have serious implications, such as premature labor, for pregnant women. b. Many infected women do not have symptoms. 4. The condition can coexist with trichomoniasis. C. Risk factors. 1. Sexual activity, particularly multiple partners (may also be found in women never sexually active). 2. Often coined as a sexually associated disease. a. Can be cultured from the prepuce of sexual partners. 3. Douching, which may alter the vaginal environment. 4. Presence of an intrauterine device (IUD). D. Pathogenesis. 1. Decrease in lactobacilli, particularly H202 (hydrogen peroxide) -producing. 2. Increase in various anaerobic bacterial pathogens (often by a factor of 100 to 10,000). 3. Lack of inflammation. a. Mobiluncus and Bacteroides produce succinic acid, which may inhibit leukocyte formation, producing infection without inflammation: in mild bacterial vaginosis, there is less inhibition of leukocytes, so one may see inflammation. E. Clinical features. 1. Subjective findings. a. Increase in vaginal discharge. b. Fishy odor, particularly after intercourse, due to presence of alkaline secretions that release amines. (1) Semen has a high pH (7 to 9). (2) Lubrication secreted by the vaginal epithelial cells during sexual stimulation also has a high pH. 2. Objective findings. a. Uniform discharge that adheres to the vaginal walls like spilled milk. b. Mild erythema or absence of inflammation of vulvar or vaginal tissues. F. Diagnosis. Needs three of the following four criteria (Amsels criteria). 1. pH of 4.5 or higher. a. Highest sensitivity. b. Lowest specificity because it can be elevated in concomitant infections, semen, medications, douching, and blood. 2. KOH: Positive whiff testamine volatilized when the pH is increased. Uniform, homogenous vaginal discharge. FIGURE 8-7 Classic clue cells of bacterial vaginosis. Note excess cocci obscuring cell margins. 4. Presence of clue cells in saline preparation (Fig. 8-7). a. Stippled or granular mature epithelial cells that appear speck led rather than translucent, resembling fried eggs sprinkled with pepper. b. The nucleus remains distinct, thus aiding identification of the cell. c. Small, pleomorphic, gram-negative coccobacilli adhering to surface of epithelial cells so that the cell wall becomes indistinct (75% of cell margin obscured). (1) May be confused with vacuolated squamous cells, which also contain small, dark spots. (2) Focus up and down to distinguish between coccobacilli stuck on the surface of the cell with bacterial vaginosis, and vacuoles found within the cell itself. d. Often comprise between 10% and 50% of epithelial cells. e. High sensitivity (98.2%) and specificity (94.3%). 5. Additional findings. a. Absence or relative scarcity of lactobacilli. b. Possible presence of Mobiluncus species such as Mobiluncus curtisii or Mobiluncus mulieris. (1) Highly motile, anaerobic, gram negative. (2) Short-curved, comma cells. (3) Present in 50% to 89% of patients. c. Few leukocytes (unless a concomitant infection is present, such as trichomoniasis). (1) Ratio of PMNs to epithelial cells is less than or equal to 1. j. Floating background bacteria between epithelial cells, which usually outnumber lactobacilli. k. Figure 8-8 demonstrates various characteristics. G. Grams stain. 1. Results unreliable because 50% of women normally harbor bacterial pathogens in low numbers. 2. Not usually necessary because wet mount study is often diagnostic. 3. The diagnosis is based on the stippled appearance of epithelial cells due to uniformly spaced coccobacilli, a reduction of Lactobacillus morphotypes, and an increase in small gram-negative rods and gram-positive cocci. H. Cultures. 1. Not helpful. 2. Anaerobes can be recovered from healthy women. I. Pap smear. 1. May show inflammation and atypical squamous cells of undetermined significance (ASCUS). 2. Bacterial vaginosis may be a cofactor in carcinoma in situ. (This is another good reason to screen asymptomatic women during routine examinations. A yellowish discharge indicates the presence of a large number of leukocytes that have undergone a partial lytic breakdown. More commonly seen with endocervicitis. FIGURE 8-8 Bacterial vaginosis. X. Trichomoniasis explained. A. Some comments. 1. Causes about 10% of all cases of vaginitis; however, the prevalence seems to be decreasing. 2. Almost exclusively sexually transmitted; present in 30% to 40% of sexual partners of infected women. 3. Can cause nongonococcal urethritis. 4. Chronic trichomoniasis can reduce the glycogen content of the cells, causing vaginal lining to become thinner and more prone to ulceration. 5. Primarily affects the vagina but can affect the cervix, Bartholins glands, urethra, and bladder. 6. Many infections are asymptomatic. B. Identification of trichomoniasis. 1. Trichomonads are unicellular, anaerobic protozoans. 2. Actively motile by virtue of four filaments of equal length. a. One to two times the length of the organism itself. b. Protrude from the forward end of the trichomonad. 3. Teardrop shape of various sizes. a. A little larger than polymorphonuclear leukocytes. b. Smaller than a mature epithelial cell but larger than its nucleus. C. Replication. 1. Binary division. 2. Transfer from one host to another only in the presence of moisture. D. Effects of pH. 1. If below 4.5, the organism appears rounded. It is difficult to distinguish. 2. Usually pH is -5.0 (pH below 5.0 virtually eliminates the possibility of trichomoniasis). E. Predisposing factors. 1. Hypoacidity of vaginal secretions due to cervical mucorrhea (estrogen effect) or menstruation. 2. Exogenous estrogen, including estrogen replacement therapy, estrogen creams, and oral contraceptives (possibly). F. Clinical features. 1. Subjective findings. a. Profuse, often malodorous discharge. (1) Variable appearance. (2) Classic appearancefrothy, yellow to green. b. Pruritus, vaginal burning. 2. Objective findings. a. Vulvar edema and erythema. b. Strawberry cervix (ecchymotic petechiae) occasionally present (30% of the time). G. Diagnosis. 1. Observations using saline. a. Patience and diligence at the microscope is often necessary. b. Trichomonads visible only in saline. Lysed in KOH. c. Time is a critical factor. (1) Susceptible to oxygen, cool temperature, and drying. (This may be another reason to examine the saline slide or side first.) (2) If wet mount cannot be performed immediately, place cotton-tipped applicator with vaginal secretions in a test tube with 1/2 inch of normal saline, as described on p. 162. (3) The organisms will remain motile for at least 1/2 hour unless they dry out or saline is old (must change saline every 3 months or else it becomes hypertonic). d. May warm slide slightly by passing a match under it to in crease motility. Microscope light may warm. e. Squamous epithelial cells present. (1) Immature parabasal and intermediate cells may be present with marked or chronic infection. f. Polymorphonuclear leukocytes are increased due to the in flammation (may be dramatic). g. Lactobacilli may be present. h. Candida may be noted concomitantly (rare). 2. Characteristics of trichomonads in saline. a. Flagella never visible under low power and sometimes visible under high power. b. Healthy trichomonadsundulate, jerk, or twitch or actively move in the direction of the flagellae. c. Unhealthy trichomonads assume a rounded shape, and they are more difficult to identify, sluggish, and usually visible only under high power. d. Mobility is reduced when cold. (1) Keep warm, and view immediately. (2) Motility may be hampered by large numbers of polymorphonuclear leukocytes. e. They assume a rounder shape when they are dry or drying. f. Trichomonads can provoke a strong WBC response. Carefully examine clumps of WBCs that may surround and attach to a trichomonad. g. Figure 8-9 demonstrates characteristics of trichomoniasis. 3. Observations using KOH preparation. a. Trichomonads are lysed. b. Possible presence of amine odor (50%). 4. Pap smear. a. Usually does not reveal trichomonads because they are immotile by the time they are evaluated. b. Positive predictive value of only 40%. 5. Grams stain. a. Trichomonads can be identified by Grams stain but offers no real advantage over a careful wet mount. b. More difficult to distinguish from PMNs by this method. 6. CultureTrichomonas. a. Most sensitive (95%). b. Easy to perform. c. Not readily available. d. Limit use to those in whom diagnosis is suspected but not seen on wet mount. 7. Gonorrhea culture. Perform on all women with trichomoniasis because up to 60% of woman with trichomoniasis may also have gonorrhea.  FIGURE 8-9 Trichomoniasis 8. Urinalysis. Organism may be clearly visualized due to lack of other cellular debris. XI. Cytolytic vaginitis explained. A. Some comments. 1. Caused by destruction of vaginal epithelial cells by the acid environment caused by the overgrowth of lactobacilli. 2. Previously termed Dderleins cytolysis after the Dderlein species of lactobacilli. a. Over 80 different species of lactobacilli have been discovered. 3. This infection is often confused with candidiasis because symptoms are similar, especially if premenstrual and chronic. How ever, microscopic findings are much different. B. Clinical features. 1. Subjective findings. a. Pasty discharge. b. Pruritus, vulvar dysuria. c. Symptoms worsen during the luteal phase. d. Low-grade burning or discomfort; increased with sexual activity. e. Lack of odor. 2. Objective findings. a. Vulvar tissues may be erythematous and edematous. b. Discharge may be thick or flocculent (clumpy). C. Diagnosis. 1. Observations of saline preparation. a. Large number of epithelial cells. b. False clue cells. (1) Long rods (lactobacilli of varying lengths). (2) May be adherent to epithelial cells (intermediate) (Fig. 8-10). (3) May be confused with the clue cell of bacterial vaginosis. c. Contains cytoplasmic debris from fragments of epithelial cells destroyed by acid environment. d. Stippled nuclei. e. Negative for Candida, trichomonads, and clue cells. f. Rare leukocytes. g. Figure 8-11 demonstrates the characteristics of cytolysis. 2. Observations of KOH preparation. a. Bacteria lysed. b. Negative odor. 3. pH is low (3.5 to 4.0). 4. Culture recommended to rule out Candida infection. 5. Grams stain not recommended. FIGURE 8-10 False clue cell in cytolytic vaginosis. Note excess dumping of lactobacilli on squamous cell. 6. Pap smear. a. Shows cytolysis on routine smears. b. Should not be used as a diagnostic tool because wet mount is reliable and readily available. D. Treatment consists of increasing the pH of the vagina by means of sodium bicarbonate douches or baths. FIGURE 8-11 Cytolysis. 1. Recommend 30 to 60 gm per 1 L of warm water two to three times per week, then once weekly as needed. XII. Lactobacillosis explained. A. Some comments. 1. Condition characterized by an increase in vaginal discharge and discomfort. 2. May occur after antimycotic treatment following treatment of a Candida infection. 3. The incidence is unknown. 4. Has elongation of bacteria, particularly anaerobic lactobacilli. B. Clinical features. 1. Features resemble those of candidiasis. a. Thick, white, creamy, or curdy discharge. b. Associated with vaginal itching, burning, and irritation. 2. Symptoms tend to occur 7 to 10 days before menses (second half of menstrual cycle), reaching a peak shortly before menstruation, after which it disappears after menses, only to recur before the next menses. C. Diagnosis. 1. Saline. a. Many long (40 to 75 um in length) serpiginous rodlike lacto bacilli, previously termed Leptothrix. Normal rods are be tween 5 and 15 /im. b. May be confused with filaments of candidiasis (thinner strands). c. Mature epithelial cells are present with few PMNs. d. Figure 8-12 demonstrates the characteristics of lactobacillosis. Differs from cytolytic vaginitis in that rods are longer and less abundant. FIGURE 8-12 Lactobacillosis. D. Treatment with amoxicillin and clavulanate is clinically successful in 86% of patients. Baking soda douche is not as effective as it is with cytolysis. XIII. Desquamative inflammatory vaginitis (DIV) explained. A. Some comments. 1. Associated with overstimulation of vaginal mucosa from un-known causes. a. May be associated with lichen planus of the mouth and genitals. b. Overabundance of squamous cells, which act as a substitute for bacteria. c. Commonly misdiagnosed as trichomonas infection; must rule out cervical cancer. 2. Incidence may be underestimated. B. Clinical featuresmay resemble trichomoniasis or atrophic vaginitis with bacterial infection. 1. Subjective findings. a. Thick, profuse discharge accompanied by dyspareunia and pruritus. b. No odor. 2. Objective findings include ecchymotic and petechial lesions on the vulva, vagina, and cervix. C. Diagnosis. 1. Wet mount. a. Many PMNs. b. Many basal and parabasal cells (hallmark of the disease). c. Few mature epithelial cells. d. Naked nuclei. e. Negative clue cells, yeast forms, or trichomoniasis. f. Absent lactobacilli with few microorganisms. Red blood cells may be present. Figure 8-13 demonstrates the characteristics of DIV. FIGURE 8-13 Desquamative inflammatory vaginitis (DIV) TABLE 8-9 Microscopic Structures That May Be Identified in a Wet Mount Preparation (in Order)SalineKOHLactobacilliYeast formsCoccihyphaeWhite blood cells (polymorphonuclear cells)pseudohyphaeSquamous epithelial cells (varying degrees of maturity)myceliaClue cellssporesFalse clue cellschlamydiasporesTrichomoniasisblastosporesRed blood cells2. KOH. a. Negative whiff test. 3. pHabove 4.5. 4. Culture and Grams stain. a. Gram-positive cocci (mainly group B Streptococci). D. Treatment with clindamycin cream is more effective than with estrogen or cortisone creams. Table 8-9 summarizes the findings to record from the wet mount examination. XIV. Atrophic vaginitis explained. A. Some comments. 1. Inflammation of the vaginal epithelium occurs due wholly and in part to a lack of estrogen. 2. Found in breastfeeding women and those with natural or surgical menopause, or in patients taking Depo-Provera. 3. Epithelium is thin and lacks glycogen due to a decrease in endogenous estrogen. B. Clinical features. 1. Subjective findings. a. Vaginal dryness. b. Dyspareunia. c. Vulvar and vaginal irritation and burning. d. Possible spotting. e. Vulvodynia, especially if the patient uses Depo-Provera. 2. Objective findings. a. Thin and smooth vaginal walls; lack of rugae. b. Inflammation or exudate may be present. c. Smooth, shiny vulva with adherence of labia. C. Diagnosis. 1. Saline preparation (see Ch. 13). a. Parabasal cells. b. Negative for Candida.  FIGURE 8-14 Atrophic vaginitis. c. Be alert for bacterial vaginosis or trichomoniasis. d. Fewer lactobacilli. e. Increased polymorphonuclear leukocytes. f. Figure 8-14 demonstrates the characteristics of atrophic vaginitis. 2. KOH preparation. a. Negative whiff test or Candida. 3. pH of vagina rises to 5.5 to 7, which can support many infections. 4. If caused by Depo-Provera, the examiner may need to check the patients estradiol levels. If the levels are 20 /xg or less, the patient needs to be treated with 20 mg ethinyl estradiol every day. XV. Vaginal cultures. A. Procedure. An adjunct to the wet mount; is needed only if the wet mount is inconclusive. Often performed too frequently. 1. Wipe cervix free of discharge (particularly if copious, slippery estrogenic mucus may make collection of columnar cells difficult). 2. Observe any special instructions or precautions from the laboratory. 3. If a cervical culture is needed, sample columnal cells from the endocervical area. a. Insert the swab from the cervical sample into the cervical os. b. Rotate several times (some cultures indicate 30 to 60 seconds). c. Withdraw sample and place in specified tube or container. d. Label with name and presumptive diagnosis. 4. Vaginal culture. Take sample from vaginal pool. Label. XVI. Grams stain of vaginal secretions. A. The procedure. 1. Briefly heat fix the slide that contains the smear of vaginal secretions. 2. Flood the slide with gentian violet stain solutions for 10 seconds. 3. Wash the slide in water. 4. Flood it with Grams iodine solution for 10 seconds. 5. Rinse it again with water. 6. Decolorize it with acetone and alcohol solutions for 10 seconds. 7. Flood it with safranin stain for 10 seconds. 8. Wash it in water a third time. 9. Cover with a glass coverslip, and view it under a microscope. 10. Add a drop of saline on top of the coverslip in order to use the oil immersion lens (without having to add oil). B. Stain of various organisms. 1. Gonorrhea. Intracellular gram-negative diplococci. 2. Bacterial vaginosis. Small pleomorphic gram-negative cocco-bacilli. 3. Trichomoniasis. a. Pale staining. b. Pear-shaped parasites. Candida. Gram-positive budding organisms. XVII. Other tests. A. Positive swab test. 1. Mucopurulent secretion from the endocervix that appears yellow or green when viewed on a white cotton-tipped swab. 2. Suggests chlamydia or gonococcal cervicitis. B. Urinalysis (see Ch. 9). 1. If urine sediment shows both white blood cells and more than five squamous epithelial cells per high-powered field, consider a wet mount. a. Determine the source of the WBCs. b. Rule out possible vaginal or cervical infection. 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