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.
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.
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.
Alcohol blood tests detect and measure alcohol use. Learn about types of alcohol blood tests, how testing is conducted, and how to understand your test results.
5-HIAA is a breakdown product of serotonin. The 5-HIAA test measures blood levels to help diagnose and monitors treatment for a carcinoid tumor that produces serotonin.
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.
Vanillylmandelic acid (VMA) is one of the breakdown products (metabolites) of epinephrine (adrenaline) and norepinephrine. The VMA test primarily detects or rules out tumors called neuroblastomas in children.
