--- title: "how long does benzodiazepines stay in hair" description: "How long does benzodiazepines stay in hair? Hair testing detects benzodiazepines for up to 90 days or longer. Call (877) 731-6362 for testing details." author: "AMH Nationwide" date: "2026-08-28" tags: ["how long does benzodiazepines stay in hair"] canonical: "https://amhnationwide.com/how-long-does-benzodiazepines-stay-in-hair/" last_updated: "2026-08-31" --- # how long does benzodiazepines stay in hair **By AMH Nationwide** | August 28, 2026 How long does benzodiazepines stay in hair? Hair testing detects benzodiazepines for up to 90 days or longer. Call (877) 731-6362 for testing details. --- How long does benzodiazepines stay in hair? Benzodiazepines can be detected in hair samples for up to 90 days or more, depending on hair length and other factors. Hair testing analyzes drug incorporation in the hair shaft, providing a longer detection window than urine or blood tests. Call (877) 731-6362 to arrange a benzodiazepine hair test. [DETECTION WINDOW](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) ## What is the detection window for benzodiazepines in hair? Benzodiazepines are traceable in hair for about 90 days or longer after use. This extended detection window arises because hair grows approximately 1 cm per month, and drugs incorporated into the hair shaft remain stable over time. Standard analysis typically examines the proximal 3.9 cm (1.5 inches) of hair, covering roughly three months of drug intake. Detection beyond 90 days is possible if longer hair samples are tested. Hair testing thus reveals past benzodiazepine use far beyond the few days detection offered by [urine](https://amhnationwide.com/urine-drug-testing/) or blood tests. This makes hair testing useful for employers, courts, and others needing a historical record of substance use. SCIENTIFIC BASIS ## How do benzodiazepines incorporate into hair and get detected? Benzodiazepines enter hair through the bloodstream during hair follicle formation. As hair cells grow, drug molecules become embedded in the hair matrix. Additionally, sweat and sebum can deposit small amounts onto hair surfaces, but incorporation into the hair shaft is the primary mechanism measured. In the laboratory, hair samples undergo decontamination to remove external contaminants. Then, benzodiazepines are extracted from the hair matrix using chemical solvents. Analysis is performed with sophisticated instruments such as gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-tandem mass spectrometry (LC-MS/MS), providing high specificity and sensitivity. TESTING PROCESS ## How does AMH Nationwide conduct benzodiazepine hair testing? AMH Nationwide facilitates benzodiazepine hair testing through its network of over 20,000 collection sites nationwide. Clients call (877) 731-6362 to arrange testing. AMH provides the lab order and directs individuals to the nearest collection location; there is no online ordering option. At the collection site, a trained technician cuts approximately 100-120 strands of hair close to the scalp, typically from the crown. The sample is securely sent to one of five national labs: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox. These labs are CAP and CLIA accredited, ensuring quality and reliability. Every non-negative test result is reviewed by a certified Medical Review Officer (MRO) who evaluates medical explanations and confirms findings before releasing results. FACTORS AFFECTING DETECTION ## What factors influence how long benzodiazepines stay detectable in hair? Several factors impact detection duration and concentration levels of benzodiazepines in hair: – Hair length: Longer hair extends the detection window by encompassing more growth months. – Hair color and type: Darker, coarser hair can bind more drug molecules, potentially increasing detected concentrations. – Metabolism and frequency of use: Chronic or heavy use results in higher drug levels in hair compared to occasional use. – Cosmetic treatments: Bleaching, dyeing, or perming can degrade or reduce detectable drug levels. Environmental exposure and external contamination are minimized by lab decontamination procedures, ensuring accurate results. ## Arrange Benzodiazepine Hair Testing Today To obtain reliable and accredited benzodiazepine hair testing, call AMH Nationwide at (877) 731-6362. We will provide lab orders and direct you to a nearby collection site. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) COMPARISON ## How does hair testing for benzodiazepines compare to urine or blood tests? Hair testing provides a longer detection window than urine or blood tests. Urine typically detects benzodiazepines for 1 to 7 days post-use, while blood tests detect only hours to a few days due to rapid metabolism. Hair testing cannot detect very recent use within the past few days since hair must grow out to incorporate the drug. It reveals historical use over weeks to months. Urine and blood tests are more appropriate for detecting current impairment or recent ingestion. | Test Type | Detection Window for Benzodiazepines | | --- | --- | | Hair Test | Up to 90 days or longer (depending on hair length) | | Urine Test | 1 to 7 days | | Blood Test | Hours to a few days | REGULATORY CONTEXT ## Are benzodiazepine hair tests compliant with regulations? Hair testing for benzodiazepines conducted by AMH Nationwide follows stringent regulatory and accreditation standards. The laboratories involved are CAP and CLIA accredited, and testing aligns with [SAMHSA](https://www.samhsa.gov/workplace/drug-testing) recommendations for forensic and employment drug testing. For federally regulated safety-sensitive positions under DOT, urine tests with the federally certified [49 CFR Part 40](https://www.transportation.gov/odapc/part40) protocol are mandatory, as hair testing is not approved for these roles. Hair testing is commonly used for non-DOT employment, legal cases, and monitoring programs. RESULTS AND INTERPRETATION ## How are benzodiazepine hair test results processed and interpreted? Following lab analysis, any positive or non-negative benzodiazepine findings undergo review by a certified Medical Review Officer (MRO). The MRO assesses potential legitimate medical explanations such as prescribed medications or cross-reactivity. Confirmed positive results provide qualitative and sometimes quantitative data about benzodiazepine presence and approximate timeframe of use based on hair segment tested. Negative results indicate no detected drug levels above established cutoffs. Cutoff levels for benzodiazepines in hair are typically in the low picogram per milligram range, ensuring high sensitivity while limiting false positives. 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-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 Typically, 100-120 strands of hair, approximately 1.5 inches long, are collected close to the scalp. This sample covers about 90 days of drug history. Yes, chemical treatments like bleaching or dyeing can reduce detectable drug levels. However, labs perform decontamination to minimize external factors. No, hair testing generally does not detect use within the past week. Urine or blood tests are preferred for recent intake. AMH partners with Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox to ensure quality and accuracy. Yes, these tests are widely accepted due to their scientific rigor, accreditation, and MRO review process. Call (877) 731-6362 to request a lab order and be directed to a nearby collection site. Online ordering is not available. 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-long-does-benzodiazepines-stay-in-hair/