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Read the information on urine drug test.

A urine drug test is employed to screen the presence of prescription and illegal drugs in the system of the subject by chemical analysis of the urine specimen. These tests are a commonplace in workplaces including pre employment drug testing, post accident drug test, random screening or in case of legal proceedings such as probation. Urinalysis is the most common method of determining whether an individual is under the influence of illegal drugs. There are several tactics used by abusers to pass a drug test without quitting the use of drugs. The internet is a great resource and has several websites providing info on drug testing methods. There is a relationship that exists between aspirin and drug test as aspirin is believed to interfere with the chemicals in the urine drug test.

If you are thinking of coming clean in a urine drug test, then the urine must be a clean catch sample which means that you need to catch the midstream urine. It is necessary to clean the private areas before going in for a drug screening. The lab requires one or two ounces of urine for detecting the presence of toxins. In United States, a drug test is used to detect the presence of most commonly abused five drugs counting amphetamines, cannabis, opiates, cocaine and PCP. As an individual uses drugs, the metabolites get excreted through the urine and can be easily detected in a urine drug test. After the specimen collection, the sample is sent to standard drug testing labs and an immunoassay is performed to screen the sample. If the urine sample tests positive, then a confirmatory test using GC/MS method is done. This eliminates the chances of false positives.

Under the guidelines of Substance Abuse and Mental Health Administration Services, the immunoassay must detect the presence of illegal drugs above the predetermined threshold levels. Drug traces that fall below the cutoff levels will register a negative result. The test results could be normal or abnormal. Abnormal test results are those which show that one of the specified drugs was detected in the urine specimen. If an abnormal result comes up, a test is performed again to verify the results but that is generally discretion of the group.