--- title: "Hair follicle test results levels chart" description: "Understand hair follicle test results levels chart and cutoff levels. Learn how to read hair drug test results accurately. Call (877) 731-6362 for details." author: "AMH Nationwide" date: "2026-08-28" tags: ["hair follicle test results levels chart", "hair follicle test results levels chart | hair strand drug test results explained uk | hair follicle drug test results chart | how to read hair follicle test results levels | hair test cutoff levels | how much is 500 pg mg | 1 pg mg meaning | hair follicle drug test cutoff levels"] canonical: "https://amhnationwide.com/hair-follicle-test-results-levels-chart/" last_updated: "2026-08-28" --- # Hair follicle test results levels chart **By AMH Nationwide** | August 28, 2026 Understand hair follicle test results levels chart and cutoff levels. Learn how to read hair drug test results accurately. Call (877) 731-6362 for details. --- The hair follicle test results levels chart provides a detailed breakdown of drug concentrations detected in hair samples. It shows cutoff levels used to determine positive or negative results. Understanding this chart helps interpret hair strand drug test results explained UK and US standards. Call (877) 731-6362 for expert guidance. OVERVIEW ## What is a hair follicle test results levels chart? A hair follicle test results levels chart displays the concentration of drugs detected in hair samples, measured in picograms per milligram (pg/mg). It helps interpret whether drug levels exceed established cutoff thresholds, indicating recent or past drug use. These charts are essential for understanding hair follicle drug test results accurately. CUT OFFS ## What are hair follicle drug test cutoff levels? Hair follicle drug test cutoff levels are the minimum drug concentration values used to determine a positive test result. For example, the common cutoff for THC-COOH is 1 pg/mg, while cocaine cutoff levels are typically 500 pg/mg. These cutoffs help labs and Medical Review Officers distinguish between incidental exposure and actual drug use. THC-COOH cutoff: 1 pg/mg Cocaine cutoff: 500 pg/mg Opiates cutoff: 300 pg/mg Amphetamines cutoff: 500 pg/mg Phencyclidine (PCP) cutoff: 25 pg/mg INTERPRETATION ## How to read hair follicle test results levels? Reading hair follicle test results levels involves comparing detected drug concentrations against cutoff values. Levels above the cutoff indicate a positive result, while levels below suggest a negative or inconclusive outcome. The results reflect drug use over the previous 90 days approximately, as hair grows about 1 cm per month. Detected level > cutoff = positive Detected level Levels near cutoff may require Medical Review Officer evaluation Hair length tested typically covers 90 days of drug use DETECTION ## What drugs are detected and how long with hair follicle tests? Hair follicle tests detect drugs like marijuana, cocaine, opiates, amphetamines, and PCP. They provide a [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) of up to 90 days, reflecting chronic or repeated drug use rather than single events. The test is less affected by short-term abstinence or passive exposure compared to [urine](https://amhnationwide.com/urine-drug-testing/) tests. Marijuana (THC-COOH): up to 90 days Cocaine: up to 90 days Opiates (morphine, codeine): up to 90 days Amphetamines: up to 90 days PCP: up to 90 days ## Need Help Understanding Your Hair Follicle Test Results? Contact AMH Nationwide at (877) 731-6362 for expert assistance interpreting your hair follicle drug test results levels chart. We guide employers, courts, and individuals through the testing process. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) LAB NETWORKS ## Which labs process hair follicle drug test results? AMH Nationwide routes hair follicle samples 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. Each lab uses validated methods with cutoff levels aligned to [SAMHSA](https://www.samhsa.gov/workplace/drug-testing) and CAP standards. All non-negative results are reviewed by certified Medical Review Officers. COMMON QUESTIONS ## What does 500 pg/mg or 1 pg/mg mean in hair test results? The units pg/mg stand for picograms of drug per milligram of hair. For example, 500 pg/mg means 500 trillionths of a gram of drug per milligram of hair. This quantifies how much drug is incorporated into the hair shaft, with higher values indicating more significant drug use or exposure. 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 Hair follicle drug tests detect drug use for up to 90 days because hair grows about 1 cm per month and the test analyzes a 1.5 inch sample representing approximately three months of growth. Passive exposure is unlikely to produce drug levels above established cutoff thresholds. Hair testing is designed to avoid false positives from environmental contamination. Standard panels typically test for marijuana (THC-COOH), cocaine, opiates (morphine, codeine, heroin metabolites), amphetamines, and PCP, with cutoff levels set to detect meaningful drug use. Hair is collected by cutting approximately 1.5 inches from close to the scalp, usually from the crown area. The sample reflects drug use over the prior 90 days. No. DOT-regulated testing requires federally certified urine testing under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). Hair testing is used for non-DOT roles. AMH provides the lab order and directs you to a nearby collection site. There is no online ordering. Call (877) 731-6362 to arrange testing. 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/hair-follicle-test-results-levels-chart/