![]() If a doctor has prescribed an opioid painkiller and you use them as directed, these drugs will show up on your test. This may indicate the potential of a false positive.Ĭertain medications may influence the results of the test. One 2017 study did find inconsistency between self-reporting of cannabis use and the results of hair drug tests. The GC/MS also guards against false-positive results caused by foods like poppy seeds or hemp seeds. This second test can also test for specific drugs and can detect as many as 17 different drugs. ![]() The second, called GC/MS, is a widely accepted method for confirming a positive result. The first, called ELISA, is able to deliver a negative or positive result within 24 hours. To guard against a false positive, laboratories conduct two tests. Your results won’t be affected if you wash your hair, dye your hair, or use styling products. During testing, the collected hair is washed and tested for environmental contamination that could change the results of the test. The collection and testing of hair for this test follows a very specific set of standards to increase accuracy. Because hair growth rates vary from person to person, this test can’t accurately determine when in the 90 days drugs were used. Can the test identify the date of drug use?Ī hair drug test detects a pattern of repeated drug use over the last 90 days. They’ll use confidential means, like a secure fax, a phone call, or an online interface to share test results.īecause lab results are confidential health information, you’ll need to sign a release before the results are passed on to your workplace. The laboratory responsible for testing will deliver the results to the individual or organization requesting the test. In some cases, improper collection of the hair specimen may result in the test being rejected completely. This test also identifies the specific drugs used.Īn inconclusive result isn’t common when testing procedures are followed. All nonnegative tests undergo a second test, called gas chromatography/mass spectrometry (GC/MS). Additional testing is required to confirm a positive result.Ī positive drug test is confirmed after 72 hours. ![]() This test determines if the hair sample is negative for drug use.Ī negative result indicates that you haven’t engaged in illicit drug use over the past 90 days. A test called ELISA is used as a screening test. A negative result can be determined within 24 hours of hair removal.
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