False positives for amphetamines

• [PDF File]Frequency of False Positive Amphetamine Screens due to ...

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  Cross Reactants /potential reactants and cross-reactants Cross reactivity of structrally similar substances can be a problem associated with immunoassay methods, which can result in false positive or negative results. Screening technologies are predominantly immonoassay techniques which have proven to be highly sensitive but are of limited

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• Drug Test - What will cause a false positive for Cocaine on a urine t…

  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]Case Reports of Aripiprazole Causing False-Positive Urine ...

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  as potentially causing false-positives, the results should be verified through confirmatory testing (i.e. MS) or, when feasible, by providing a sample when the drug is no longer in the system. Table : Drugs Reported to Cause False-Positive Urine Drug Screen Results Y- False-positive for: Drugs Causing False-Positives Amphetamines

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• [PDF File]Drugs Implicated in False-Positive Results of Drug Screens

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  testing of initial immunoassay test positives. This is the same procedure required by SAMHSA (formerly NIDA) in the testing of urine samples. GCMS (and its successor LS/MS/MS) confirmation is scientifically capable of distinguishing the target drug from other drugs that might be present in sweat, preventing false positives.

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• [PDF File]STIMULANTS & MARIJUANA

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  false positive result Sometimes a drug without structural similarity may bind to antibody (false positive) Lack of cross reactivity across a class may result in false negatives Qualitative result only (or semi-qualitative) Rapid result *Jagerdeo E, Schaff JE.

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• [PDF File]Cross Reactants /potential reactants and cross-reactants

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  • Very low likelihood of false positives • Methamphetamine methamphetamines ( l,d-isomers) amphetamines • Tests positive up to 72 hours after last use, up to one week for chronic use • False positives: Vicks vapor rub, selegiline, bupropion

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  running out early; false negative (incorrect use of EIA rather than GCMS testing); urine adulterated . False positives. Are the results due to illicit use, a false positive on the screen, or a known metabolite of a prescribed medication? In considering prescribed medications, false positives on EIA (and GCMS where specified) may result from:

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• [PDF File]Ordering and Interpreting Urine Drug Tests

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  Frequency of False Positive Amphetamine Screens due to Bupropion Using the Syva Emit II Immunoassay ... for amphetamines by GC and 128 (35%) failed to confirm. Among the 234 confirmed positives, records reflected ... patients with identified bupropion use were false positives

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

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  Case Reports of Aripiprazole Causing False-Positive Urine Amphetamine Drug Screens in Children Justin Kaplan, PharmD a,b, Pooja Shah, PharmD , Brian Faley, PharmDa,b, Mark E. Siegel, MDc Urine drug screens (UDSs) are used to identify the presence of certain abstract medications.

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• [PDF File]Medication Monitoring; Drug Testing in Clinical Practice ...

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  Pain Management Opioid Safety A Quick Reference Guide (2014) VA Academic Detailing Service ... (e.g. positive for amphetamines) AND is: ... resulting in false-positive for marijuana mainly consist of ibuprofen and naproxen and modern tests do not result in false positives ; + THC concentrations in hemp products are low enough to

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