Frequently Asked Questions

Why Hair?

What is a hair follicle drug test?
How accurate is hair testing for drug use?
What does “90 day detection window” mean?
Does it matter when the donor last used drugs?
What drugs does HairConfirm™ screen for?
What time period does the HairConfirm™ hair drug test cover?
How does hair drug testing compare to urine drug testing?
How effective is a home hair drug test kit for detecting drug use?
Can a hair test be adulterated?
Can external exposure to drugs (i.e. secondhand marijuana smoke) affect results?
Can hair drug testing tell the date and time of drug use?
Can a hair drug test detect one time use?
Can hair be affected by cross-reacting substances such as over-the-counter medications?


How fast does head hair grow?
How soon after use can a drug be detected in hair?
Can tests be run on people with little to no hair?
What is the shortest detection time period that can be accurately evaluated?
Can hair collected from a hairbrush be used?
How does the hair drug test work?

How do I collect the hair sample?
How do I ship the sample to the lab?
If head hair is short, can I submit body hair?
My sample got lost in the mail and didn’t arrive at the lab. What do I do?


How will I obtain the test results?

Will the test result remain confidential?
How will I read the test results?
What does the test report look like?
What does “QNS” mean in my results?
Why did Marijuana (THC) show up negative?

Do you have any support services after the results?
Where can I buy HairConfirm®?

Our Lab

Has my sample arrived?
Is your laboratory CLIA accredited?
What are the drug test cut-off levels used by HairConfirm?
Does the lab provide Gas Chromatography Mass Spectrometry (GC/MS) confirmation for all positive results?
What methodology do you employ?