Medications that cause false positives

• [PDF File]Chapter 14: False-Positive Blood Alcohol

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  False-positives can happen due to interference from a drug that com-petes with alcohol during metabolism by the liver. False-positives may also occur during autopsy. In this case, the chest cav-ity blood may be contaminated with alcohol present in the stomach. In this case, the blood needs to be obtained from an alternative site and alcohol lev-

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• [PDF File]Commonly prescribed medications and potential false ...

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  Sep 06, 2014 · Commonly prescribed medications and potential false-positive urine drug screens NaNcy c. Brahm, LyNN L. yeager, mark D. Fox, ... the use of medications with the potential for false-positive UDS results may present a significant ... profen could cause false-positive results. Urine samples from consent-ing volunteers (n = 120) ...

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• [PDF File]Urine drug screening

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  False Positives: The basic screening urine drug test can be susceptible to false positives. The detection level for opiates on immunoassay screening was increased to 2,000 ng/ml to avoid cross reaction with foods, such as poppy seeds. There are a number of medications that may cross react with immunoassay drug screens and cause false positives.

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• [PDF File]Interpretation of Opiate Urine Drug Screens

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  The first test done is the immunoassay. This can be susceptible to false positives, so when a positive result is obtained it is confirmed by GC/MS.or the pain management urine drug screen,/MS is done for these drugs regardless of the immunoassay screen result: morphine, codeine, oxycodone, oxymorphone, hydrocodone, hydromorphone.

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• [PDF File]Urine Drug Testing for Chronic Pain Management

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  metabolites, typical detection cut-off, potential sources of false positives, and length of time they can be detected in urine). Urine drug testing in the management of chronic pain. Adapted from: Urine Drug Testing in Clinical Practice (2010) Gourlay DL Heit HA. Caplan, YH

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• [PDF File]Positive and negative false estimates of serum creatinine

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  Several drugs cause positive and negative interference through these mechanisms resulting in false positive and negative estimates of serum creatinine which may affect glomerular filtration rate (GFR) calculation also. Endogenous substances also affect the creatinine assay systems resulting in false estimate of serum creatinine concentration.

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• [PDF File]Ordering and Interpreting Urine Drug Tests

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  False negatives. Are the results due to the patient running out of medication early, diversion, a tampered specimen, or a threshold issue (e.g., workplace testing using a high threshold for reporting a positive test to avoid false positives that require a job intervention)? For EIA (and GCMS where specified) false negatives may result from:

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• [PDF File]False-Positive Interferences of Common Urine Drug Screen ...

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  both promethazine and chlorpromazine can cause false-positive amphetamines UDS and recommend confirmation of any pre-sumptive positive results with a secondary method (1). The commonly prescribed antidepressant, trazodone, has been reported to cause false positives in 3,4-methylenedioxymethamphetamine (MDMA) UDSs. A study con-

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• [PDF File]False Positive Urine Screens for Phencyclidine

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  mined to be the cause of death by the medical examiner. In the emergency department, tramadol has been known to produce a false positive for P P in urine immunoassay tests (EMIT II; DRI). Dextromethorphan hydrobromide is an antitussive present in over 125 cough and cold remedies. Dextromethorphan will inhibit serotonin reuptake and

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• [PDF File]False-Positive HIV Test Results

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  test specificity is 99.8%, results for approximately 20 specimens will be false-positive. In this case, of the 220 with positive results (200 true-positives plus 20 false-positives), 91% are actually infected with HIV. The number of true positives far exceeds the number of false positives.

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