How far back can a hair sample drug test go
How Far Back Can a Hair Sample Drug Test Go for Reliable Results
How far back can a hair sample drug test go? Hair drug testing typically detects drug use within the past 90 days, providing a longer detection window than urine or saliva tests. This method is reliable for employers, courts, and individuals needing extended drug use history. Call (877) 731-6362 to schedule testing.
What is the detection window of a hair sample drug test?
The detection window of a hair sample drug test is generally up to 90 days. Hair testing analyzes a 1.5-inch segment of hair closest to the scalp, representing approximately three months of drug use. This extended window makes hair testing useful for identifying past drug consumption beyond the reach of urine or saliva tests, which usually detect recent use within days to weeks.
Hair testing is not effective for detecting drug use within the past 7 days since hair needs time to grow above the scalp.
How does AMH Nationwide process hair drug tests?
AMH Nationwide routes hair sample drug tests through five national lab networks: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. The collected hair sample is analyzed using scientifically validated methods to detect drug metabolites incorporated into the hair shaft as it grows.
Every non-negative hair drug screen is reviewed by a certified Medical Review Officer (MRO) to ensure accuracy and interpret results in context. This review helps confirm legitimate medical explanations or prescription use before finalizing results.
AMH Nationwide directs clients to a collection site for sample submission; there is no online ordering. Call (877) 731-6362 to arrange testing.
Which drugs can be detected in a hair sample drug test?
Hair drug tests can detect a wide range of substances including:
– Amphetamines
– Cocaine
– Marijuana (THC)
– Opiates (heroin, morphine, codeine)
– Phencyclidine (PCP)
– Benzodiazepines and other prescription medications (depending on panel)
The test panel and detection capabilities vary by lab and requester requirements. Some panels also include synthetic opioids and other emerging drugs.
Detection depends on the drugs’ incorporation into hair and the length of hair tested. Contact AMH at (877) 731-6362 for specific panel options and pricing.
Who orders hair sample drug tests and why?
Hair drug testing is commonly ordered by employers, courts, probation officers, and individuals seeking a longer-term drug use history. It is especially useful when recent use is not the only concern but patterns over months are relevant.
Employers use hair testing for pre-employment screening or random testing where a longer detection window is required. Courts and probation agencies may require hair tests to monitor compliance over time. Individuals may use hair testing for personal monitoring or legal reasons.
Hair testing is not suitable for Department of Transportation (DOT) safety-sensitive roles, which require federally certified urine testing under 49 CFR Part 40.
Schedule Your Hair Sample Drug Test Today
To learn how far back a hair sample drug test can go for your situation, contact AMH Nationwide. We direct you to a collection site for professional sample collection and lab analysis. Call (877) 731-6362 to get started.
Can hair sample drug tests detect one-time or recent drug use?
Hair drug tests are less effective at detecting very recent drug use because drugs take approximately 5-7 days to become incorporated into hair above the scalp. One-time or very recent use within this timeframe may not be detected.
Additionally, hair testing reflects cumulative drug exposure over weeks to months rather than isolated incidents. Passive exposure to drugs is unlikely to produce positive results at the thresholds used by accredited labs.
For recent drug use detection, urine or saliva tests are more appropriate due to their shorter detection windows.
AMH Nationwide provides guidance on appropriate test types. Call (877) 731-6362 for advice.
Are hair drug tests accepted for DOT-regulated testing?
Hair sample drug tests are not accepted for Department of Transportation (DOT) safety-sensitive testing. DOT regulations require urine testing using the federally certified protocol under 49 CFR Part 40.
Hair drug testing is used primarily for non-DOT roles or other purposes where extended detection windows are needed. Employers must follow DOT guidelines when testing for safety-sensitive positions.
AMH Nationwide provides DOT-compliant urine drug testing and can direct clients accordingly.
Contact AMH at (877) 731-6362 to discuss testing needs and compliance requirements.
Common Questions
Hair drug test results typically take 3 to 5 business days after the sample reaches the lab. Complex panels or Medical Review Officer reviews may extend this time slightly.
Hair drug tests detect many common drugs such as cocaine, amphetamines, marijuana, and opiates. However, detection depends on the specific test panel ordered by the requester.
If hair is too short or unavailable, body hair may be used, but it has a less consistent detection window. In some cases, an alternative test like urine may be recommended.
Hair color and type can influence drug incorporation, but accredited labs account for these factors during analysis to ensure accurate results.
Passive exposure is unlikely to cause a positive hair drug test because labs use cutoff levels designed to avoid false positives from environmental contact.
Costs vary depending on the test panel and detection window. Contact AMH Nationwide at (877) 731-6362 for a personalized quote.
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.