A urine drug screen is designed to detect illegal (and some prescription) drugs in the urine.
How the Test is Performed
It is necessary to collect a "clean-catch" (midstream) urine sample.
As you start to urinate, allow a small amount to fall into the toilet bowl (this clears the urethra of contaminants). Then, in a clean container, catch about 1 - 2 ounces of urine and remove the container from the urine stream. Give the container to the health care provider or assistant.
You may be asked to remove all your personal belongings. You will then be placed in a room where you have no access to your personal items or water. In this environment, you cannot dilute the sample, nor can you use someone else's urine for the test.
If the sample tests positive the sample is then taken to the laboratory for evaluation.
How the Test Will Feel
The test involves only normal urination.
Why the Test is Performed
The test is performed to detect the presence of illegal (and some prescription) drugs in your urine, which indicates recent use of the drugs.
Normal Results
No drugs in the urine.
What Abnormal Results Mean
If the test result is positive, it is helpful to confirm it with gas-chromatography mass spectrometry (GC-MS). In some cases, a test will register a false positive. This can result from interfering factors such as some foods, prescription medications, and other drugs.
The GC-MS will help tell the difference between a false positive or a true positive, resulting from the presence of an illegal drug.
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Posted by Drug Test Australia
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Original http://www.nlm.nih.gov/medlineplus/ency/article/003364.htm
