--- title: "19-Panel Hair Follicle Drug Test: Accuracy & Reliability | AMH Nationwide" description: "Learn about 19-panel hair follicle drug test accuracy with certified lab methods and MRO review. Ensure reliable results. Call (877) 731-6362 for info." author: "AMH Nationwide" date: "2026-08-27" tags: ["19-panel hair follicle drug test accuracy"] canonical: "https://amhnationwide.com/19-panel-hair-follicle-drug-test-accuracy/" last_updated: "2026-08-27" --- # 19-Panel Hair Follicle Drug Test: Accuracy & Reliability | AMH Nationwide **By AMH Nationwide** | August 27, 2026 Learn about 19-panel hair follicle drug test accuracy with certified lab methods and MRO review. Ensure reliable results. Call (877) 731-6362 for info. --- The 19-panel hair follicle drug test accuracy depends on certified laboratory protocols, including initial screening and confirmatory testing, strict cutoff levels, and Medical Review Officer (MRO) evaluation to rule out false positives. This test detects drug use over a 90-day window with high reliability. Call (877) 731-6362 for details. TEST OVERVIEW ## What determines the accuracy of a 19-panel hair follicle drug test? The accuracy of a 19-panel hair follicle drug test is determined by multiple factors including the laboratory’s certified testing methods, cutoff levels for each drug analyte, and the sequential process of initial screening followed by confirmatory testing. This ensures precise identification of drug metabolites in hair samples. AMH Nationwide routes collections 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 validated methods to maintain test accuracy. SCREENING VS CONFIRMATION ## How do initial screening and confirmation testing impact 19-panel hair follicle drug test accuracy? Initial screening uses immunoassay techniques to quickly detect the presence of drug metabolites above established cutoff levels. However, immunoassays can produce false positives due to cross-reactivity. Confirmation testing, performed by gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-tandem mass spectrometry (LC-MS/MS), specifically identifies and quantifies drug metabolites. This two-step approach greatly increases overall test accuracy. Initial Screen: Rapid, sensitive, possible false positives Confirmation Test: Specific, accurate, rules out false positives CUTOFF LEVELS ## What role do cutoff levels play in 19-panel hair follicle drug test accuracy? Cutoff levels are the minimum concentration of drug metabolites required to trigger a positive result on both screening and confirmation tests. These thresholds are set to minimize false positives from environmental contamination or incidental exposure. Each drug in the 19-panel has its own cutoff, established according to federal or industry standards. The use of strict cutoff levels ensures that only relevant drug use is reported. CERTIFIED LAB METHODOLOGY ## How does certified lab methodology ensure accuracy in 19-panel hair follicle drug testing? Certified laboratories follow standardized protocols for hair collection, sample preparation, and testing procedures. This includes chain-of-custody documentation and quality control measures to prevent contamination or sample mix-ups. AMH Nationwide directs clients to collection sites that comply with these standards, and testing is conducted by labs accredited by regulatory bodies, ensuring reliable results. ## Get Accurate 19-Panel Hair Follicle Drug Testing To arrange a 19-panel hair follicle drug test with certified labs and thorough MRO review, contact AMH Nationwide. Call (877) 731-6362 for assistance. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) MRO REVIEW ## What is the role of the Medical Review Officer (MRO) in ensuring 19-panel hair follicle drug test accuracy? Every non-negative hair follicle test result undergoes review by a certified Medical Review Officer. The MRO evaluates the lab findings alongside the individual’s medical history and prescription medications to confirm or refute a positive result. This professional review helps identify legitimate explanations for drug metabolites, preventing false positives due to legitimate drug use or lab errors. FALSE POSITIVES ## How are false positives ruled out in 19-panel hair follicle drug tests? False positives are minimized through confirmatory testing using highly specific techniques like GC-MS or LC-MS/MS, which distinguish drug metabolites from similar compounds. In addition, the MRO review assesses potential interfering factors such as medications, environmental exposure, or sample contamination before confirming a positive result. 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 19-panel hair follicle drug test detects drug metabolites deposited in hair over approximately 90 days, providing a long [detection window](https://amhnationwide.com/hair-follicle-drug-test-detection-window/) compared to [urine](https://amhnationwide.com/urine-drug-testing/) or saliva tests. Strict cutoff levels and confirmatory testing minimize false positives from environmental exposure. Additionally, MRO review evaluates such factors before confirming results. Employers, legal entities, and medical professionals order 19-panel hair follicle drug tests for comprehensive drug use screening, especially for non-DOT safety-sensitive roles. No. AMH Nationwide facilitates lab orders and directs clients to collection sites. Testing is performed by certified national laboratories. The 19-panel tests for a broad range of substances including amphetamines, cocaine, opiates, cannabinoids, PCP, benzodiazepines, barbiturates, and synthetic drugs. Contact AMH Nationwide by calling (877) 731-6362 to arrange testing. We provide the lab order and direct you to an authorized collection site. 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/19-panel-hair-follicle-drug-test-accuracy/