--- title: "Should i cut my hair before a hair drug test" description: "Should I cut my hair before a hair drug test? Learn how hair length affects detection and testing accuracy. Call (877) 731-6362 for details." author: "AMH Nationwide" date: "2026-08-28" tags: ["should i cut my hair before a hair drug test"] canonical: "https://amhnationwide.com/should-i-cut-my-hair-before-a-hair-drug-test/" last_updated: "2026-08-28" --- # Should i cut my hair before a hair drug test **By AMH Nationwide** | August 28, 2026 Should I cut my hair before a hair drug test? Learn how hair length affects detection and testing accuracy. Call (877) 731-6362 for details. --- Should I cut my hair before a hair drug test is a common question. Hair drug testing detects drug use over a 90-day window by analyzing hair strands. Cutting hair too short may limit the sample but does not prevent detection. AMH Nationwide uses certified labs and Medical Review Officers to ensure accurate results. Call (877) 731-6362. TEST BASICS ## What is a hair drug test and how does it detect drug use? A hair drug test analyzes hair strands to detect drug metabolites deposited in the hair follicle from bloodstream exposure. It can detect drug use over approximately 90 days, longer than [urine](https://amhnationwide.com/urine-drug-testing/) or saliva tests. The test requires a hair sample typically 1.5 inches long, reflecting about three months of hair growth. AMH Nationwide routes hair drug tests through five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, and ExperTox. These labs use scientifically validated methods to identify drug compounds and metabolites reliably. HAIR LENGTH ## Does cutting hair before a hair drug test affect the results? Cutting your hair before a hair drug test does not prevent detection of drug use but may affect sample adequacy. Labs usually require at least 1.5 inches of head hair to cover the 90-day [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/). If hair is shorter, the lab may use body hair, which provides a less precise timeframe. Short hair samples can still contain drug metabolites, but the detection window shortens proportionally. Cutting hair immediately before the test will not erase drug history already present in the hair shaft. COLLECTION PROCESS ## How does AMH Nationwide handle hair drug test collection? AMH Nationwide provides the lab order and directs the requester to a nearby collection site from a network of over 20,000 nationwide. Collection sites follow strict chain-of-custody and sample collection protocols to maintain test integrity. Hair samples are collected by trained personnel, usually from the crown of the head. If head hair is insufficient, body hair may be accepted. Collected samples are sent to one of the five national lab networks for analysis. ACCURACY AND RELIABILITY ## Can hair drug tests be manipulated by cutting or other means? Hair drug tests are highly reliable and resistant to adulteration. Cutting hair short may limit sample size but does not erase drug metabolites already incorporated into hair strands. Every non-negative result is reviewed by a certified Medical Review Officer (MRO) to ensure accuracy and interpret findings. AMH Nationwide does not support or provide any methods to evade or cheat drug tests. ## Need a Hair Drug Test? Contact AMH Nationwide to schedule your hair drug test collection at a certified site near you. Call (877) 731-6362 for assistance. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) DETECTION WINDOW ## What is the detection window for drugs in hair samples? Hair drug tests detect drug use over a 90-day period based on hair growth rates and metabolite deposition. The standard 1.5-inch hair sample corresponds to approximately three months of history. Shorter hair provides a shorter detection window, while longer hair can show a longer history but labs typically analyze the most recent 1.5 inches for consistency. WHEN TO CALL ## When should I contact AMH Nationwide about hair drug testing? You should call AMH Nationwide at (877) 731-6362 to discuss hair drug testing needs, sample collection locations, or to get information about testing protocols and detection windows. AMH Nationwide does not offer online ordering. All testing requires a lab order and collection at an authorized site. Call (877) 731-6362 to speak with a representative. 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 Cutting hair short does not remove drug metabolites already incorporated into hair strands. It may limit sample length but does not erase drug history. Yes. If head hair is insufficient, body hair can be collected, though it provides a less precise detection window. Hair drug tests typically detect drug use within the past 90 days based on the standard 1.5-inch hair sample. Hair drug tests provide a longer detection window and are less susceptible to short-term abstinence but both tests have specific uses. No. AMH Nationwide requires a lab order and collection at an authorized site. There is no online ordering. Certified Medical Review Officers review all non-negative hair drug test results to confirm accuracy and validity. 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/should-i-cut-my-hair-before-a-hair-drug-test/