Physician lab doing hair drug tests

Hair Drug Tests

Physician looking at hair follicle for hair drug test

What is a hair drug test?

Hair drug tests use hair to test for drugs by screening for traces of drugs in the hair follicle. These traces are carried to the hair follicle through the bloodstream and will stay in your hair for up to 90 days. Because of this long detection period—and because they’re very difficult to cheat—hair drug tests are very popular with employers.

    Lady holding hair for hair follicle drug test

    What a hair drug test tests for?

    Hair drug tests can test for a lot of different substances, including cocaine, marijuana, opiates, methamphetamine, ecstasy, and PCP. They can sometimes even help find out when someone last used drugs, and if they’ve stopped. Even people with short hair can get a hair drug test, but the clinician will need more hair to perform the test. If someone is bald or has a shaved head, they can use body hair to get a hair drug test. 

      Physician checking hair drug test results on computer

      Can you cheat a hair drug test?

      It’s almost impossible to cheat a hair drug test. The hair sample is usually collected at the time of the visit, so there’s not an opportunity to substitute someone else’s hair. Because the testing window is so long—within 90 days of last drug use—and because hair is so good at storing information about what’s in your blood, typical methods to cheat don’t work.

        Get hair drug tests for your workforce

        Concentra can perform hair drug tests at any of our more than 300 locations nationwide. We can customize your results to screen for specific substances so that you can get exactly what you need for your workforce. Fill out our form and we’ll get in touch with you about our hair drug test options and how to get started.

        Are you a patient? Find out more about drug tests at Concentra.