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?

Protecting safety

 Hair drug testing in Brazil

We discuss why Brazil chose hair testing for its professional drivers, most commonly-detected drugs, and regulations for the transportation industry.

Hair testing panels & cutoffs

Loading drug test specimens into instrument

Our hair testing drug panels yield reliable results that allow you to look back at patterns of drug use.
See our test panels

Hair testing collections

Collector cuts a hair drug test sample

Locate a nearby collection site and use our resources to help you create the most effective hair drug testing program.
Collect a hair specimen