Urine drug screen

Before the test, you may be asked to remove all your clothes and wear a hospital gown. You will then be placed in a room where you have no access to your personal items or water. This is so you cannot dilute the sample, or use someone else's urine for the test. This test involves collecting a "clean-catch" (midstream)…

The test involves only normal urination.

The test is performed to detect the presence of illegal and some prescription drugs in your urine. Their presence may indicate that you recently used these drugs. Some drugs may remain in your system for several weeks, so the drug test needs to be interpreted carefully.

No drugs in the urine, unless you are taking medicines prescribed by your health care provider.

If the test result is positive, another test called gas-chromatography mass spectrometry (GC-MS) may be done to confirm the results. The GC-MS will help tell the difference between a false positive and a true positive. In some cases, a positive test will be a false positive. This can result from interfering factors…

Bluth MH, Pincus MR, Abraham NZ. Toxicology and therapeutic drug monitoring. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 24. Breuner CC. Substance abuse. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC,…