--- title: "How to get thc out of hair follicles" description: "Learn how to get THC out of hair follicles and understand hair drug testing science. For reliable testing info, call AMH Nationwide at (877) 731-6362." author: "AMH Nationwide" date: "2026-08-28" tags: ["how to get thc out of hair follicles", "how to get thc out of hair follicles | how to get thc out of your hair follicles"] canonical: "https://amhnationwide.com/how-to-get-thc-out-of-hair-follicles/" last_updated: "2026-08-28" --- # How to get thc out of hair follicles **By AMH Nationwide** | August 28, 2026 Learn how to get THC out of hair follicles and understand hair drug testing science. For reliable testing info, call AMH Nationwide at (877) 731-6362. --- How to get THC out of hair follicles is a common question for those facing hair drug tests. THC metabolites remain in hair for up to 90 days, making removal difficult. AMH Nationwide processes hair tests through five national labs with certified review. Call (877) 731-6362 for testing guidance. TEST BASICS ## What is hair follicle drug testing for THC? Hair follicle drug testing detects THC metabolites embedded in the hair shaft. When marijuana is used, THC-COOH metabolites enter the bloodstream and bind to growing hair cells. This method can detect drug use for up to 90 days, depending on hair length. AMH Nationwide routes hair samples to five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, and ExperTox. Each test undergoes review by a certified Medical Review Officer. [DETECTION WINDOW](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) ## How long does THC stay in hair follicles? THC metabolites can be detected in hair follicles for approximately 90 days after use. Hair grows roughly 0.5 inches per month, and standard tests analyze 1.5 inches of hair closest to the scalp. This provides a 3-month detection window. One-time or infrequent use may be less likely to produce a positive result, but chronic or heavy use will consistently show in hair testing. REMOVAL MYTHS ## Can you get THC out of your hair follicles to pass a drug test? Scientifically, THC metabolites are deposited inside the hair shaft and cannot be removed by washing or detox shampoos. Hair treatments may damage hair but do not reliably eliminate metabolites. AMH Nationwide does not endorse any products or methods claiming to remove THC from hair. The best approach is to understand testing procedures and timelines. TESTING PROCESS ## How does AMH Nationwide handle hair follicle THC testing? AMH Nationwide provides the lab order and directs individuals to a collection site. There is no online ordering. Samples are sent to one of five national labs for processing and analysis following strict chain-of-custody procedures. All non-negative hair test results are reviewed by a certified Medical Review Officer to ensure accuracy and address any medical explanations. ## Need Hair Follicle THC Testing? Call AMH Nationwide at (877) 731-6362 to arrange hair follicle drug testing through one of five national labs. Our certified Medical Review Officers ensure reliable results. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) WHO ORDERS ## Who typically requires hair follicle THC testing? Employers, [probation](https://amhnationwide.com/hair-follicle-drug-test-probation/) officers, and courts often require hair follicle testing to assess long-term drug use, including THC. Hair testing is preferred for its extended detection window compared to [urine](https://amhnationwide.com/urine-drug-testing/) or saliva tests. Individuals may also request hair testing for personal knowledge or legal reasons through AMH Nationwide by calling (877) 731-6362. ALTERNATIVE TESTS ## Are there alternatives to hair follicle testing for THC? Urine and saliva tests detect recent THC use, typically within hours to days, while hair testing detects use over months. DOT-regulated safety-sensitive positions require federally certified urine testing under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). Hair testing is not used for DOT roles but may be used for non-DOT employment or legal purposes. AMH Reviewed & Maintained By AMH Nationwide Customer Service AMH Nationwide is BBB A+ accredited and routes every order through Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, or ExperTox, all of which use multiple lab certification agencies and standards such as [SAMHSA](https://www.samhsa.gov/workplace/drug-testing)-aligned laboratory protocols, the ANSI National Accreditation Board for forensic testing and calibration, the College of American Pathologists (CAP), and Clinical Laboratory Improvement Amendments (CLIA). Every non-negative screen is reviewed by a certified Medical Review Officer as part of standard processing before a result is released, and chain-of-custody documentation is maintained on every collection. This page does not constitute medical or legal advice. **Last updated:** July 2026 You May Also Need [Nail Drug TestingNo head or body hair available? A 5-panel fingernail test covers a similar look-back window.Learn more →](https://amhnationwide.com/5-panel-fingernail-drug-test/)[ChildGuard: Environmental ExposureConcerned about a child or loved one? ChildGuard screens for exposure to drugs in their environment.Learn more →](https://amhnationwide.com/5-panel-hair-drug-test-environmental-exposure-childguard/)[Shorten the Detection WindowShortened options like 30 and 60 day hair panels are also available, useful when a urine test’s 1-3 day window is too short.Learn more →](https://amhnationwide.com/30-day-hair-drug-test/)[Hair ETG Alcohol TestAlso need alcohol testing? The hair ETG test screens for alcohol use, and can be added to the same collection.Learn more →](https://amhnationwide.com/etg-and-peth/) Frequently Asked Questions ## Common Questions No, washing hair or using detox shampoos does not remove THC metabolites from inside the hair shaft. These metabolites are chemically bound within the hair and are not affected by external cleaning. Typically, 1.5 inches of hair closest to the scalp is collected, representing about 90 days of growth. The sample size is usually about 100 strands or roughly the diameter of a pencil. Yes, hair follicle testing is scientifically reliable and widely accepted for detecting THC use over a 90-day period. AMH Nationwide uses accredited labs and certified Medical Review Officers to ensure accuracy. Passive exposure is unlikely to cause a positive hair test because metabolites must be incorporated into the hair from bloodstream exposure, not surface contamination. Labs follow strict protocols to avoid false positives. Results typically take 3 to 5 business days after sample collection, depending on the lab’s processing time. All non-negative results receive Medical Review Officer evaluation before reporting. No, AMH Nationwide does not provide test kits for direct ordering. We supply the lab order and direct you to a local collection site. Call (877) 731-6362 to begin the process. Sources • [SAMHSA – Mandatory Guidelines for Federal Workplace Drug Testing Programs](https://www.samhsa.gov/workplace/drug-testing) • [U.S. DOT – 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs](https://www.transportation.gov/odapc/part40) • [CDC – National Center for Health Statistics – Drug Use FastStats](https://www.cdc.gov/nchs/fastats/drug-use.htm) • [Quest Diagnostics – Employer Solutions, Hair Testing Methodology](https://www.questdiagnostics.com/) • [LabCorp – Occupational Testing Services](https://www.labcorp.com/) ## 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. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) --- **Need a drug, alcohol, HIV or STD test?** AMH Nationwide is a national lab testing agency operating since 2004, with more than 20,000 collection sites across the United States. Hair, urine, fingernail and blood testing, panels from 5 through 19, for individuals and employers. - Call: (877) 731-6377 - Find a collection site: https://amhnationwide.com/locations/ - Full page: https://amhnationwide.com/how-to-get-thc-out-of-hair-follicles/