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How long does a hair follicle drug test go back

A 38-year-old female asked:
Dr. Laura McMullen
Pediatrics 21 years experience
You : You may be getting conflicting answers because how far back the testing goes depends on how fast your hair and nails grow. When hair is tested, they ... Read More
Dr. Alan Wartenberg
A Verified Doctoranswered
A US doctor answeredLearn more
Varies: The hair testing numbers are about right, with hair growing about 1/2 inch per month, and the average length of hair tested being 1 1/2 inches, which ... Read More

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A 26-year-old female asked:
Dr. Alan Wartenberg
A Verified Doctoranswered
A US doctor answeredLearn more
About right: Depends on the length of the hair, but the average size hair will go back about 6 months. There is variability in hair growth, and depending on wheth... Read More
A 42-year-old male asked:
Dr. Heidi Fowler
Psychiatry 25 years experience
Wellbutrin: Wellbutrin has been known to cause positive drug screens for amphetamine, methamphetamine, & LSD - Lysergic acid diethylamide (not sure if these... Read More
Dr. Judith Tellerman
Clinical Psychology 42 years experience
MEDICATION: Best to discuss medication with your Psychiatrist. If uncomfortable with your Dr. consult another for a second opinion. Have a physical exam by a Dr. ... Read More
A 40-year-old female asked:
Dr. Alan Wartenberg
A Verified Doctoranswered
A US doctor answeredLearn more
Not necessarily: The only SPECIFIC test for heroin is a test for its metabolite 6-monoacetylmorphine or 6MAM. I am not sure whether this is available in swab form, but... Read More
A 35-year-old member asked:
Dr. Cynthia Rector
Psychiatry 29 years experience
Very: In comparison to a urinalysis drug test, cocaine, PCP, opiates, and methamphetamine have proven hair analysis far more effective than urine testing in... Read More
A 44-year-old member asked:
Dr. Alan Wartenberg
A Verified Doctoranswered
A US doctor answeredLearn more
Dont understand ?: Why would YOU be waiting for a test. Hair follicle tests are done by employers and other authorities to determine if someone has used drugs over a lo... Read More
A 31-year-old member asked:
Dr. Troy Ross
Occupational Medicine 24 years experience
Might get picked up: Hair testing for drugs can show positive results for up to 90 days in the past.
A 21-year-old female asked:
Dr. Jeffrey Satinover
Psychiatry 39 years experience
Maybe: Drug testing for pro (steroid) hormones is getting increasingly sophisticated. But the side effects of using spawn and its relatives are dire. The bes... Read More
A 44-year-old male asked:
Dr. Linda Callaghan
Addiction Medicine 53 years experience
Maybe.: Marijuana stays in the blood stream for up to 30 days. A hair test may detect as much as 3 months ago.
A female asked:
Dr. Yash Khanna
Family Medicine 57 years experience
Longest window of de: Hair test offers the longest window of detection.That is 90 days in a standard test test does not detect the amount but presence of thc.The testing me... Read More

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