--- title: "Blood Drug Screen: How It Works | AMH Nationwide" description: "Learn blood drug screen how it works from sample collection to MRO review. Understand the lab analysis steps. Call (877) 731-6362 for details." author: "AMH Nationwide" date: "2026-08-27" tags: ["blood drug screen how it works"] canonical: "https://amhnationwide.com/blood-drug-screen-how-it-works/" last_updated: "2026-08-27" --- # Blood Drug Screen: How It Works | AMH Nationwide **By AMH Nationwide** | August 27, 2026 Learn blood drug screen how it works from sample collection to MRO review. Understand the lab analysis steps. Call (877) 731-6362 for details. --- Blood drug screen how it works involves collecting a blood sample that is analyzed in certified labs for the presence of drugs. The process includes initial screening, confirmation testing, and a Medical Review Officer review of non-negative results. Call (877) 731-6362 to arrange testing through AMH Nationwide. SAMPLE COLLECTION ## How is the blood sample collected for a blood drug screen? The blood sample for a blood drug screen is collected by a trained phlebotomist at an authorized collection site. AMH Nationwide directs the requester to one of five national lab networks: [Quest Diagnostics](https://www.questdiagnostics.com/), [LabCorp](https://www.labcorp.com/), Omega Labs, United States Drug Testing Labs, or ExperTox for collection. The collection procedure involves drawing blood using sterile techniques, typically from a vein in the arm. The sample is then securely labeled and prepared for transport to the testing laboratory. LAB ANALYSIS ## What happens to the blood sample at the lab during a blood drug screen? Upon arrival at the lab, the blood sample undergoes an initial drug screening using immunoassay techniques to detect the presence of drugs or their metabolites. This screening is sensitive and designed to identify a broad range of substances. If the initial screen is non-negative, the lab performs a confirmation test using more precise methods such as gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-tandem mass spectrometry (LC-MS/MS) to verify the findings. TESTING PROCESS ## How does the screening and confirmation process work in a blood drug screen? The screening phase uses immunoassays that quickly detect drug markers but can produce false positives. To ensure accuracy, any non-negative result triggers a confirmation test. The confirmation test uses highly specific analytical methods to identify the exact drugs and their concentrations in the blood, eliminating false positives and providing definitive results. Screening: rapid immunoassay detection of drugs Confirmation: GC-MS or LC-MS/MS for precise identification Non-negative results always confirmed before reporting MRO REVIEW ## What role does the Medical Review Officer play in a blood drug screen? Every non-negative blood drug screen result is reviewed by a certified Medical Review Officer (MRO). The MRO evaluates the laboratory findings and reviews the individual’s medical history to determine if there is a legitimate medical explanation for the result. This review ensures the accuracy and fairness of the test results before final reporting to the requester. ## Ready to Schedule Your Blood Drug Screen? Contact AMH Nationwide to get directed to an authorized collection site and begin the testing process. Call (877) 731-6362. [Call (877) 731-6362](tel:+18777316362)[Contact Us](https://amhnationwide.com/contact-us/) LAB NETWORKS ## Which labs analyze blood drug screen samples for AMH Nationwide? AMH Nationwide routes blood drug screen samples through five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. Each lab follows strict protocols for sample handling, analysis, and reporting. This multi-network approach ensures wide geographic coverage and access to specialized testing technologies. ORDERING PROCESS ## How do you arrange a blood drug screen with AMH Nationwide? AMH Nationwide provides the lab order and directs the requester to a nearby collection site within the authorized lab networks. There is no option for online ordering; all arrangements must be made by phone. To schedule a blood drug screen or for more information about the process, call (877) 731-6362. 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 Blood drug screens typically detect drugs consumed within the past few hours to a couple of days, depending on the substance. Blood testing shows recent use more accurately than [urine](https://amhnationwide.com/urine-drug-testing/) or hair. No, DOT-regulated safety-sensitive testing requires federally certified urine testing under [49 CFR Part 40](https://www.transportation.gov/odapc/part40). Blood drug screens are used primarily for non-DOT roles. No, blood samples must be collected by trained professionals at authorized collection sites to ensure proper handling and chain of custody. If the initial blood drug screen is negative, no further confirmation testing is performed, and the negative result is reported. Turnaround times vary by lab and test panel but typically range from 1 to 3 business days after sample collection. A certified Medical Review Officer reviews all non-negative blood drug screen results to verify accuracy and consider medical explanations before reporting. 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/blood-drug-screen-how-it-works/