A drug test looks for the presence of one or more illegal or prescription drugs in your urine, blood, saliva, hair, or sweat. Urine testing is the most common type of drug screening. The drugs most often tested for include:
Barbiturates, such as phenobarbital and secobarbital
Other names: drug screen, drug test, drugs of abuse testing, substance abuse testing, toxicology screen, tox screen, sports doping tests
What is it used for?
Drug screening is used to find out whether or not a person has taken a certain drug or drugs. It may be used for:
Employment. Employers may test you before hiring and/or after hiring to check for on-the-job drug use.
Sports organizations. Professional and collegiate athletes usually need to take a test for performance-enhancing drugs or other substances.
Legal or forensic purposes. Testing may be part of a criminal or motor vehicle accident investigation. Drug screening may also be ordered as part of a court case.
Monitoring opioid use. If you've been prescribed an opioid for chronic pain, your health care provider may order a drug test to make sure you are taking the right amount of your medicine.
Why do I need a drug test?
You may have to take a drug test as a condition of your employment, in order to participate in organized sports, or as part of a police investigation or court case. Your health care provider may order drug screening if you have symptoms of drug abuse. These symptoms include:
A drug test generally requires that you give a urine sample in a lab. You will be given instructions to provide a "clean catch" sample. The clean catch method includes the following steps:
Wash your hands
Clean your genital area with a cleansing pad given to you by your provider. Men should wipe the tip of their penis. Women should open their labia and clean from front to back.
Start to urinate into the toilet.
Move the collection container under your urine stream.
Collect at least an ounce or two of urine into the container, which should have markings to indicate the amounts.
Finish urinating into the toilet.
Return the sample container to the lab technician or health care provider.
In certain instances, a medical technician or other staff member may need to be present while you provide your sample.
For a blood test for drugs, you will go to a lab to provide your sample. During the test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
Will I need to do anything to prepare for the test?
Be sure to tell the testing provider or your health care provider if you are taking any prescription drugs, over-the-counter medicines, or supplements because they may give you a positive result for certain illegal drugs. Also, you should avoid foods with poppy seeds, which can cause a positive result for opioids.
Are there any risks to the test?
There are no known physical risks to having a drug test, but a positive result may affect other aspects of your life, including your job, your eligibility to play sports, and the outcome of a court case.
What do the results mean?
If your results are negative, it means no drugs were found in your body, or the level of drugs was below an established level, which differs depending on the drug. If your results are positive, it means one or more drugs were found in your body above an established level. However, false positives can happen. So if your first test shows that you have drugs in your system, you will have further testing to figure out whether or not you are actually taking a certain drug or drugs.
Is there anything else I need to know about a drug test?
Before you take a drug test, you should be told what you are being tested for, why you are being tested, and how the results will be used. If you have questions or concerns about your test, talk to your health care provider or contact the individual or organization that ordered the test.
National Institute on Drug Abuse [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; Drug Testing: Brief Description [updated 2014 Sep; cited 2017 Apr 18]; [about 9 screens]. Available from: https://www.drugabuse.gov/related-topics/drug-testing
The medical information provided is for informational purposes only, and is not to be used as a substitute for professional medical advice, diagnosis or treatment. Please contact your health care provider with questions you may have regarding medical conditions or the interpretation of test results.
In the event of a medical emergency, call 911 immediately.
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