How long does drugs stay in hair follicles
How Long Does Drugs Stay in Hair Follicles for Reliable Detection
How long does drugs stay in hair follicles is generally up to 90 days due to hair growth cycles capturing drug metabolites. Hair drug testing offers a longer detection window than urine or saliva. AMH Nationwide routes collections through five national labs with certified Medical Review Officer review. Call (877) 731-6362.
How long does drugs stay in hair follicles?
Drugs can stay in hair follicles for up to 90 days, reflecting drug use during that period. Hair grows approximately 0.5 inches per month, and standard hair drug tests analyze about 1.5 inches from the scalp, representing roughly three months of drug intake.
This detection window is longer than urine or saliva tests, which typically detect recent use within days. Hair follicle testing captures drug metabolites incorporated into the hair shaft as it grows.
How does hair follicle drug testing work?
Hair follicle drug testing detects drug metabolites embedded in the hair shaft from the bloodstream. A small hair sample is collected, usually from the scalp, and sent to a lab for analysis.
At AMH Nationwide, samples are routed through five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. All non-negative results are reviewed by a certified Medical Review Officer to ensure accuracy and validity.
Who orders hair follicle drug testing and why?
Employers, courts, probation officers, and individuals order hair follicle drug tests to verify drug use over a longer period than urine or saliva tests allow.
This test is valuable for safety-sensitive roles and legal situations where a comprehensive drug use history is required. DOT-regulated testing does not use hair testing but requires federally certified urine protocols under 49 CFR Part 40.
Can hair follicle drug testing detect one-time or passive drug exposure?
Hair follicle testing generally detects repeated drug use rather than a single exposure because drug metabolites must accumulate in sufficient quantities.
Passive exposure, such as secondhand smoke, is unlikely to produce a positive hair test due to low metabolite levels. The test’s sensitivity and lab protocols reduce the chance of false positives.
Schedule Your Hair Follicle Drug Test Today
To arrange a hair follicle drug test or get a quote, call AMH Nationwide at (877) 731-6362. Our team will guide you to a certified collection site near you.
How do I arrange a hair follicle drug test with AMH Nationwide?
AMH Nationwide provides the lab order and directs you to one of over 20,000 collection sites nationwide. There is no online ordering option; all test requests require calling (877) 731-6362 or contacting customer service.
Pricing varies depending on the drug panel and detection window required. Call (877) 731-6362 for a personalized quote.
How reliable is hair follicle drug testing compared to other methods?
Hair follicle testing offers a longer detection window and is less susceptible to adulteration than urine or saliva tests.
AMH Nationwide’s use of five national labs and certified Medical Review Officers ensures high accuracy and compliance with SAMHSA, CAP, and CLIA standards.
Common Questions
Hair drug testing typically detects drug use for up to 90 days, depending on the length of hair sampled. This represents a longer detection window than urine or saliva tests.
Hair follicle tests are more effective at detecting repeated drug use. Single use may not produce enough metabolite accumulation for detection.
No, DOT-regulated safety-sensitive testing requires federally certified urine testing under 49 CFR Part 40. Hair testing is for non-DOT roles.
Common drugs detected include marijuana (THC), cocaine, opiates, amphetamines, and PCP. The exact panel depends on test ordering.
A small hair sample is cut close to the scalp, usually from the crown area. The sample length is about 1.5 inches to cover 90 days of growth.
Passive exposure is unlikely to cause a positive result due to low metabolite levels. Hair testing labs use strict protocols to avoid false positives.
Ready to get started?
AMH Nationwide provides the lab order and arranges collection nationwide. Every non-negative result reviewed by a certified Medical Review Officer. Call (877) 731-6362 or contact us.