GC-MS is a very specific test to identify separate compounds within a sample and is considered the “gold-standard” for drug testing. When initial screening drugs tests (called immunoassays) result in positive results, a second confirmatory (Gas Chromatography Mass Spectrometry or GC-MS) test should always be done. When urine or other specimens are collected, they are split into two samples, and one portion should be saved for confirmatory testing. The initial test (called an immunoassay) allows for quick, large scale screenings with minimal cost. The results of your drug testing should remain confidential and kept separate from the regular employee work file. 1 Confirm with the lab you visit that a second, confirmatory test will be performed on any positive drug test that may occur. Some data suggests 5% to 10% of all drug tests may result in false positives and 10% to 15% may yield false negatives. Drug screening results can negatively affect many circumstances therefore, accuracy is of the utmost importance. loss of privileges in a probation settingĮven though drug tests are common, people often have questions about the possibility of false-positive result.Negative consequences of false-positive drug testing can include: 2 Other hallucinogenics (LSD, peyote, mescaline, psilocybin). ![]()
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