Hair drug testing

Quest Diagnostics

Hair testing overview

Hair testing, tweezer of brown hair cut with lab technician

Hair drug testing is the only testing method available that provides up to a 90-day drug use history, an effective way to evaluate long-term patterns of use.

Hair testing FAQs

Scientists in laboratory performing hair testing and drug testing

What is the difference between hair testing and hair follicle testing? How much hair is cut to perform a drug test? Can a donor cheat a hair drug test?

Hair testing collections

Collector cuts a hair drug test sample

Locate a convenient hair testing collection site. A hair drug test only requires approximately 100-120 strands of hair for testing at the lab.