Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair analysis is regarded as a compelling method for identifying drug and alcohol consumption. As hair grows, biomarkers are captured within the hair strand fibers, offering a prolonged record of alcohol and drug use. Collected close to the scalp, hair can yield a detection window of roughly 3 months for substances. It's easy to collect, hard to tamper with, and straightforward to transport.
A 1.5-inch hair sample, consisting of around 200 strands (comparable to a #2 pencil) nearest the scalp, will produce 100mg, which is the optimal amount for both screening and verification. For EtG add-ons, and/or tests exceeding 10 panels, a sample size of 150mg is advised. We suggest utilizing a jeweler’s scale to weigh the sample. If scalp hair is not accessible, an equivalent quantity of body hair may be gathered. When mentioning head hair, we mean only scalp hair. Body hair encompasses all other types (such as facial and axillary hair).
Process Overview
The laboratory processing of a drug test incorporates four crucial stages: Accessioning, Screening, Extraction, and Confirmation.
Accessioning entails the preliminary handling of a sample into a lab's system, ensuring the sample was appropriately sealed and dispatched, assigning a random LAN (Laboratory Accessioning Number), and finalizing any supplementary data entry absent in the electronic custody documentation.
Screening functions as a preliminary assessment for drug presence. While it offers a cost-effective means to exclude drug use from most samples, any positive screen outcome must be affirmed to be valid in court. Samples testing positive in Screening need a further confirmation.
If a sample returns presumptive positive at the Screening phase, more hair is extracted from the initial sample for the Extraction process. Here, drugs are retrieved from the hair at significantly lower concentrations than with other methods (like urine or oral fluid), which makes hair drug screening the most challenging technique to execute.
Confirmation of positive screenings is achieved via GC/MS, GC/MS/MS, or LC/MS/MS methods. All samples presumed positive undergo washing before confirmation if required. The comprehensive laboratory process from Accessioning through to Confirmation adheres to both CAP (College of American Pathologists) Hair designation and compliance with ISO / IEC 17025 standards.
Hair drug testing advantages:
Limitations:
Note: Although often described as "hair follicle tests", the test evaluates the hair strand rather than the follicle beneath the scalp.
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