Hair Follicle Drug Test: Detection Window | AMH Nationwide
Hair Follicle Drug Test Detection Window and Its Timeline Benefits
The hair follicle drug test detection window typically covers up to 90 days, making it effective for identifying past drug use over a longer period than other tests. This test analyzes drug metabolites trapped in hair shafts, reflecting usage history. Call (877) 731-6362 to schedule a lab collection or for more details.
What is the hair follicle drug test detection window?
The hair follicle drug test detection window refers to the period during which drug use can be identified by analyzing hair samples. This test detects drug metabolites embedded in the hair shaft, reflecting drug consumption typically up to 90 days prior to collection. Unlike urine or saliva tests, it does not detect very recent use but provides a longer-term usage history.
How does the hair follicle drug test detect drugs over time?
Hair follicle drug tests detect drugs by identifying metabolites deposited in the hair follicle’s growing cells. As hair grows approximately 0.5 inches per month, a 1.5-inch sample can represent about 90 days of drug intake. Metabolites enter the hair follicle via the bloodstream and remain trapped in the hair shaft as it grows, creating a chronological record of drug exposure.
What is the typical detection window for hair follicle drug tests?
The typical detection window for hair follicle drug tests is up to 90 days. This window depends on the length of hair collected, usually 1.5 inches from the scalp. Drugs used within the past 7 days may not be detected due to the time needed for hair growth to carry metabolites above the scalp surface.
What factors influence the hair follicle drug test detection window?
Several factors can affect the detection window of a hair follicle drug test. Hair growth rate varies by individual, which might shorten or lengthen the effective detection period. Hair treatments such as bleaching or dyeing may reduce metabolite concentration, potentially impacting detection. Additionally, the type of drug, frequency of use, and sample size influence detection accuracy.
Need to Know Your Hair Follicle Drug Test Detection Window?
Contact AMH Nationwide to schedule your test or get detailed information. Call (877) 731-6362 for assistance.
How is the hair follicle drug test performed and processed?
The hair follicle drug test is performed by collecting a small sample of hair, usually 1.5 inches long, from close to the scalp. AMH Nationwide directs the requester to a collection site within its network of five national labs: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. After collection, the sample is analyzed for drug metabolites. Non-negative results are reviewed by a certified Medical Review Officer as part of standard procedure.
What are the limitations of the hair follicle drug test detection window?
The hair follicle drug test does not detect very recent drug use within the past 7 days due to the time required for metabolites to become embedded in hair above the scalp. External contamination and cosmetic hair treatments may affect test results. The test is not used for DOT-regulated safety-sensitive testing, which requires federally certified urine protocols under 49 CFR Part 40.
Common Questions
A hair follicle drug test typically detects drug use up to 90 days prior to collection, depending on hair length and growth rate.
Because hair grows about 0.5 inches per month, it takes several days for drug metabolites to appear in the hair above the scalp where samples are collected.
Yes, treatments like bleaching or dyeing can reduce metabolite concentrations in hair, potentially affecting detection accuracy.
AMH Nationwide routes hair follicle drug tests through Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox.
No, DOT-regulated testing requires federally certified urine testing under 49 CFR Part 40; hair tests are for non-DOT roles.
AMH Nationwide provides lab orders and directs you to a collection site. Call (877) 731-6362 to arrange your test.
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.