Hair Follicle Drug Test

Hair Follicle Testing

A hair follicle drug test, also known as a hair drug test, screens for illicit drug use and the misuse of prescription medication. Hair follicle drug tests may not be appropriate for determining recent drug use. That’s because it may take five to seven days for the drugs to be identifiable through a hair follicle test.

We can use hair follicle tests to check for a specific drug, or they can test a single hair sample for several different drugs or drug classes.

What is Hair Follicle?

A hair follicle is a part of the skin, which grows hair by packing old cells together. Attached inside the top of the follicle are sebaceous glands, which are tiny sebum-producing glands in almost all skin except on the palms, lips, and soles of the feet. The thicker the hair, the more the number of sebaceous glands there are.