If other drugs with similar chemical shapes are present in the sample, this can result in a "false positive." Sustiva, Protonix, and other proton pump inhibitors can cause individuals to test positive for THC, while common antibiotics such as amoxicillin can cause a person to test positive for cocaine on certain POCT devices. Amphetamine. Summary. False Positive Tramadol Urine Testing in Patients Taking Fexofenadine: A Tale of Two Consecutive Cases. doi: 10.1542/peds.2014-3333. Does Zantac (ranitidine) cause false positives for methamphetamine? Besides prescription sources, methamphetamine (ie, crystal meth) can also be produced in small, clandestine laboratories using ephedrine or pseudoephedrine as a key ingredient. After a California mom's post about testing positive for meth due to an inhaler went viral, the questions of whether an inhaler could cause a false positive on . Immunoassay technology uses antibodies to detect drug metabolites. The references of each report describing a medication whose use was associated with false-positive UDS results were also reviewed. Before have been reported among those taking Sustiva. In 1998, the federal government raised the threshold on opiates from 0.3 micrograms to 2 micrograms per milliliter, but some drug testing facilities still go by the old standard. Methamphetamine Urine Toxicology: An In-depth Review When methamphetamine is detected or both amphetamine and methamphetamine are detected, then the lab can run a d,l-isomer test to try and narrow the source of the positive methamphetamine finding (Figure 1). It is a common misconception that alcohol can cause a negative pregnancy test. False positive results on urine drug tests can happen. Off-label Use of Pain Treatment No Longer Covered by Insurance, Musculoskeletal Ultrasound: A Primer for Primary Care, The Next Barriers to Care: Your Local Pharmacy, Why Podiatric Medicine Must Embrace Pain Management. Drug tests are also performed in the workplace to identify illicit substance abuse. Labetalol can also cause a false positive for amphetamine or methamphetamine because a labetalol metabolite is structurally similar to amphetamine.
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