--- title: "At-Home Hair Drug Test Kit: Detection Window | AMH Nationwide" description: "Learn about the at-home hair drug test kit detection window and how it identifies drug use over time. Call (877) 731-6362 for details and scheduling." author: "AMH Nationwide" date: "2026-08-27" tags: ["at-home hair drug test kit detection window"] canonical: "https://amhnationwide.com/at-home-hair-drug-test-kit-detection-window/" last_updated: "2026-08-27" --- # At-Home Hair Drug Test Kit: Detection Window | AMH Nationwide **By AMH Nationwide** | August 27, 2026 Learn about the at-home hair drug test kit detection window and how it identifies drug use over time. Call (877) 731-6362 for details and scheduling. --- The at-home hair drug test kit detection window typically covers up to 90 days, allowing detection of drug use over an extended period. This test analyzes hair strands collected at a designated lab site, providing a reliable history of substance use. Call (877) 731-6362 to schedule a collection with AMH Nationwide. [DETECTION WINDOW](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) ## What is the detection window for an at-home hair drug test kit? The at-home hair drug test kit detection window generally spans up to 90 days from the date of collection. Hair grows approximately half an inch per month, and standard testing analyzes 1.5 inches of hair to detect drug metabolites deposited during that period. This long detection window is significantly longer than [urine](https://amhnationwide.com/urine-drug-testing/) or saliva tests, which typically detect recent use within days. SCIENTIFIC BASIS ## How does the at-home hair drug test kit detect drugs over this period? Drugs and their metabolites enter the bloodstream and are deposited into the hair follicle as hair grows. Since hair grows slowly and retains these substances, the test can detect drug use over weeks to months. The collected hair sample is sent to one of five national labs including [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox for analysis. Hair length analyzed: typically 1.5 inches Average hair growth rate: 0.5 inches per month Detection period: up to 90 days Test type: non-DOT regulated, suitable for non-safety sensitive roles FACTORS IMPACTING WINDOW ## What factors can shorten or lengthen the detection window? Several factors influence the effective detection window of the at-home hair drug test kit. These include the individual’s hair growth rate, hair type, cosmetic treatments, and the amount and frequency of drug use. Faster hair growth may shorten detection window as older hair is shed Hair treatments like bleaching or dyeing can reduce detectable drug levels Thicker hair may retain more metabolites, potentially lengthening detection Heavy, frequent drug use results in higher metabolite incorporation TESTING PROCESS ## How is the at-home hair drug test kit collection and analysis conducted? AMH Nationwide provides a lab order and directs the requester to a local collection site within national networks including Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, or ExperTox. The individual collects a hair sample under supervised conditions and submits it for testing. All non-negative results undergo review by a certified Medical Review Officer as standard procedure. No online ordering; contact AMH to obtain lab order Collection performed at authorized lab or collection site Sample is analyzed using scientifically validated methods Results reviewed by Medical Review Officer for accuracy ## Schedule Your At-Home Hair Drug Test Kit Collection To arrange a lab order and collection at a nearby site within the national network, call (877) 731-6362. AMH Nationwide will guide you through the process and ensure accurate testing. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) COMPARISON ## How does the hair test detection window compare to other drug tests? | Test Type | Typical Detection Window | | --- | --- | | Urine Drug Test | 1 to 7 days depending on substance | | Saliva Drug Test | 1 to 3 days | | At-Home Hair Drug Test Kit | Up to 90 days | This comparison highlights that the at-home hair drug test kit detection window is much longer, making it suitable for assessing drug use history rather than recent use. USE CASES ## Who typically uses the at-home hair drug test kit and why? Employers, legal entities, and individuals use the at-home hair drug test kit to detect long-term drug use patterns. It is especially useful when assessing non-DOT regulated employees or when a longer detection window is required. This test is not suitable for DOT-regulated safety-sensitive positions, which require federally certified urine testing protocols. 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 The test can detect drug use up to 90 days prior to the collection date by analyzing 1.5 inches of hair growth. Yes, treatments like bleaching or dyeing can reduce drug metabolite levels in hair, potentially shortening the detection window. No, DOT-regulated testing requires urine samples collected under a federally certified protocol; hair testing is for non-DOT roles. Samples are analyzed by one of five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, or ExperTox. Yes, all non-negative screens are reviewed by a certified Medical Review Officer as part of standard processing. Contact AMH Nationwide by calling (877) 731-6362 to obtain a lab order and be directed to a collection site near you. 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/at-home-hair-drug-test-kit-detection-window/