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Avoid everything that could cause a problem and result in another false positive for amphetamines. Common over-the-counter anti-inflammatory pain medications such as. The test itself is simple and painless, and only requires a urine sample. Immunoassay testing for methamphetamine uses antibodies to look for certain drug metabolites (these are the compounds a drug breaks down into), and is the most common test used for initial screening. Urine is most commonly used due to its ease of collection. Pseudoephedrine is a decongestant that is commonly used to treat nasal congestion and sinus infections. Research conducted at Boston Medical Center shows that drug tests produce false positives in 5% to 10% of cases. . Epub 2015 Dec 13. 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). A saliva test can identify meth within 10 minutes after use, and it will produce positive results up to four days later If there has been an overdose, flumazenil can be used as a Table 1 Approximate detection times for a urine drug screen and substances causing false-positives Drug Detection Window Substance Causing False-Positives Alcohol 2 . The first test is an immunoassay (IA) screening test for the amphetamine class of medications, which includes both amphetamines and methamphetamines. The drug has been linked to false-positive drug test results for amphetamine. Tim Thoelecke, CSAPA, is the founder of InOut Labs. 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 . Research conducted at Boston Medical Center shows that drug tests produce false positives in 5% to 10% of cases. Hair drug test: Positive doesn't always mean positive. Safdari KM, Converse C, Dong F, MacDougall NA, Hyer K, Runyon A, Ahlering H, Comunale ME. Several common prescriptions, over-the-counter medications, herbs, vitamins, and even some foods could trigger a false positive drug test. you should drink of water per day. There are a few distinct sources of methamphetamine. If, under their physicians approval, the person can be off the medicine for that length of time, a negative test should result..