A drug screen (also called a drug test) is the collection and analysis of blood, urine, hair, saliva, or another specimen type to evaluate for the presence of chemicals and contaminants left behind in the body after drug use.
A drug test uses a biological sample (such as blood or urine) to detect the presence or absence of a legal or illegal drug.
Drug tests are ordered and performed in a variety of settings with a variety of techniques. Drugs include legal substances such as alcohol and tobacco, as well as over-the-counter medications, prescription medications and illegal substances.
A single drug test can’t determine the frequency and intensity of substance use and, thus, can’t distinguish casual substance use from substance use disorders.
Your body metabolizes (breaks down) various drugs at different rates, so the timeframe for detecting certain drugs in your system can be very specific and vary widely from substance to substance. Urine drug testing (UDT) is the most common test for detecting drugs.
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