Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair testing is recognized as an effective means for detecting drug and alcohol consumption. Hair captures a long-term record of substance use by embedding biomarkers within the fibers of the growing hair strand. When collected near the scalp, hair can offer a detection period of up to approximately three months for alcohol and drugs. Hair is straightforward to gather, relatively challenging to tamper with, and easy to transport.
A sample length of 1.5 inches consisting of about 200 hair strands (roughly the width of a #2 pencil) nearest to the scalp can provide 100mg of hair, which is the optimal amount for both screening and verifying. For EtG, additional tests, and/or those exceeding 10 panels, a 150mg sample is recommended. Using a jeweler’s scale to weigh the sample is advised. If scalp hair isn't feasible, a similar quantity of body hair can be used. When mentioning head hair, it refers exclusively to scalp hair. Body hair pertains to all other types (facial, axillary, etc.).
Process Overview
Laboratory processing of a drug testing result involves four primary steps: Accessioning, Screening, Extraction, and Confirmation.
Accessioning involves the preliminary processing of a sample into a lab’s system. This step ensures the sample was properly sealed and shipped, allocates a random LAN (Laboratory Accessioning Number), and inputs any extra data not covered by an electronic chain of custody system.
Screening entails a quick preliminary check for drug abuse. Although Screening is a cost-effective means of discounting drug usage for most samples, any positive outcome must be confirmed for legal acceptability. Samples with presumptive positive results during Screening require a secondary confirmation.
For samples testing presumptively positive at the Screening phase, additional hair is retrieved from the initial sample and prepared for Extraction. At this stage, drugs are extracted at significantly lower concentrations compared to other methods (such as urine or oral fluid), highlighting the complexity of hair drug screening.
Any positive screen result is confirmed using GC/MS, GC/MS/MS, or LC/MS/MS. Before confirmation, all presumptive positive samples are washed as necessary. The entire lab process from Accessioning to Confirmation is inspected under both the CAP (College of American Pathologists) Hair designation and accreditation to ISO/IEC 17025 standards.
Advantages of hair drug testing:
Limitations:
Note: Commonly dubbed as "hair follicle tests," this test examines the hair strand itself and not the follicle beneath the scalp.
Choosing hair follicle testing over urine testing in Niota, TN, provides distinct advantages. Key benefits include:
This advanced testing option ensures confidence in the results obtained.
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Benefits include:
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