Nicotine and cotinine tests detect evidence of nicotine in the body. Learn more about when these tests may be used and how to understand your test results.
Considering a hair follicle drug test? Learn about how long drugs can be detected in the hair, which drugs can be identified, and how hair testing works.
Read about urinalysis, a common test used to diagnose and monitor a wide range of health issues, including diabetes, kidney disease, and liver disease.
Drug testing for marijuana is ordered by employers and other organizations. Learn about how long marijuana stays in your body and how testing is conducted.
Thiopurine methyltransferase (TPMT) is an enzyme that breaks down a class of drugs called thiopurines. TPMT tests are used to identify people at risk of developing severe side effects from thiopurine treatment.
