Why Most Labs Don’t Offer 6, 9 or 12-Month Hair Testing
Understanding Why Most Labs Don’t Offer 6, 9 or 12-Month Hair Testing Benefits Your Testing Choice
Why most labs don’t offer 6, 9 or 12-month hair testing is primarily due to technical limitations and industry standards. Extended hair drug testing requires specialized processing and validation that most labs do not provide. AMH Nationwide coordinates testing with five national lab networks capable of addressing complex needs. Call (877) 731-6362 to discuss your testing requirements.
Why do most labs not offer 6, 9 or 12-month hair testing?
Most labs do not offer 6, 9 or 12-month hair testing because the standard hair drug test typically covers up to 90 days. Extending detection windows to 6, 9, or 12 months involves technical challenges such as sample size, segmental analysis complexity, and limitations in current testing methodologies. Additionally, regulatory guidelines and industry demand rarely support these longer detection periods.
Extended hair drug testing requires precise segmental analysis where hair is cut into multiple sections to estimate drug use over time. This process is more costly and requires specialized expertise and equipment that many labs lack. As a result, most testing facilities focus on the standard 1.5 inch hair length representing about 90 days.
Which labs can perform extended hair drug testing for 6, 9 or 12 months?
Extended hair drug testing for longer detection windows is only available through select national lab networks with advanced capabilities. AMH Nationwide routes collections through five major national labs: Quest Diagnostics, LabCorp, Omega Labs, United States Drug Testing Labs, and ExperTox. Among these, specialized labs like Omega Labs and United States Drug Testing Labs offer more comprehensive segmental hair testing options.
These labs have validated procedures to process longer hair samples and perform detailed segmental analyses to approximate drug use over extended periods.
What are the technical challenges of 6, 9 or 12-month hair testing?
Hair grows approximately 0.5 inches per month, so testing for 6 to 12 months requires 3 to 6 inches of hair sample. Collecting and processing this length can be difficult due to hair availability and sample integrity.
Segmental analysis involves cutting the hair into multiple sections to isolate drug use in specific time frames. This increases complexity, cost, and the potential for sample contamination or degradation.
Longer detection windows also pose challenges in ensuring accuracy and consistency, as external factors like hair treatments and environmental exposure can affect results.
Are 6, 9 or 12-month hair tests accepted for regulatory or DOT purposes?
No, 6, 9, or 12-month hair tests are not accepted for Department of Transportation (DOT) or other federally regulated safety-sensitive testing. DOT requires federally certified urine testing under 49 CFR Part 40 and does not recognize hair testing for these roles.
Extended hair drug testing is primarily used for non-DOT roles and specialized cases where longer detection windows are desired for investigative or monitoring purposes.
AMH Nationwide ensures all DOT-regulated testing follows the federally certified urine protocol and directs hair testing to appropriate non-DOT scenarios.
Need Extended Hair Drug Testing?
Call (877) 731-6362 to discuss your specific testing needs with AMH Nationwide. We coordinate with five national lab networks to provide accurate and compliant extended hair drug testing options.
How does AMH Nationwide handle extended hair drug testing orders?
AMH Nationwide does not provide online ordering for any tests, including extended hair drug testing. Instead, AMH provides the lab order and directs the requester to a collection site within the five national lab networks.
Clients must call (877) 731-6362 to discuss the appropriate testing panel, detection windows, and collection logistics. Pricing varies based on the testing panel and detection window selected.
Every non-negative hair test screen is reviewed by a certified Medical Review Officer as part of standard processing to ensure accuracy and compliance.
How does extended hair testing compare to standard hair and other drug tests?
Extended hair testing offers a longer detection window compared to standard hair tests which usually cover 90 days. However, it is more complex, costly, and less commonly available.
Urine and oral fluid tests cover shorter detection windows (days to weeks) but are widely accepted for regulatory purposes.
Hair testing is less invasive and harder to adulterate but requires sufficient hair length and specialized laboratory analysis.
| Test Type | Detection Window |
|---|---|
| Standard Hair Test | Up to 90 days |
| Extended Hair Test | 6 to 12 months (varies) |
| Urine Test | 1 to 4 days typical |
| Oral Fluid Test | 24 to 48 hours |
Common Questions
No, most hair tests cover up to 90 days. Tests claiming to detect drug use from a year ago require extended segmental analysis and longer hair samples, which few labs offer.
Extended hair testing requires longer samples and detailed segmental analysis, increasing lab labor, complexity, and costs compared to standard tests.
No, DOT drug screening mandates federally certified urine testing under 49 CFR Part 40. Hair testing is not accepted for safety-sensitive DOT roles.
Call (877) 731-6362 to speak with AMH Nationwide staff. We provide the lab order and direct you to a collection site within our five national lab networks.
All non-negative hair test results are reviewed by a certified Medical Review Officer to confirm findings and ensure proper interpretation.
Yes, hair must be long enough to cover the detection period. Insufficient hair length limits the detection window and may require alternative testing methods.
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.