A member asked:

I'm not wondering how long thc stays in hair,,but i'm curious as why it stays in the hair follicle longer than blood or urine?

4 doctors weighed in across 4 answers
Dr. Heidi Fowler answered

Specializes in Psychiatry

Cannabis.: Single use of marijuana should be out of your urine in 1 to 7 days. Regular use of marijuana – should be out of urine in 7 to 100 days. Single use marijuana can be detected 12 to 24 hours in blood. Regular use marijuana can be detected for 2 to 7 days in blood. Marijuana regular use detected in hair for months. Single use might not be picked up in hair.

Answered 7/4/2014

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Well...: Blood and urine are filtered rapidly. The hair has a longer life and there are no filters, so the THC stays until the hair falls

Answered 9/29/2016

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Dr. John Munshower answered

Specializes in Family Medicine

Hair testing: Hair follicles trap and filter traces of the drug in their growth period. And as the gradual growth of hair is inevitable, these chemicals are found to be stored in the hair and can be found during the hair drug test.When compared with urine specimen testing, hair testing provides nearly twice the number of positives and a longer detection window.

Answered 7/4/2014

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Hair stays: thc stays in the hair longer than in the blood and urine. This is because the blood is constantly being filtered (cleaned) by your kidneys and the urine is regularly eliminated from your body and replaced. Your hair, however, does not get filtered or replaced, so the thc remains.

Answered 1/13/2015

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Thc hair follicle testing how long does it stay in your system .

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How long does THC stay in hair follicles?

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