Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair analysis has become acknowledged for its effectiveness in identifying drug and alcohol consumption. Hair strands store long-term markers of drugs and alcohol by embedding biomarkers within the fibers of the strands as they grow. When clipped near the scalp, hair can give a detection range of up to roughly three months for alcohol and drugs. The collection of hair samples is straightforward, not easily adulterated, and convenient to transport.
A segment measuring 1.5 inches with about 200 hair strands (approximately the thickness of a standard pencil) taken nearest the scalp will yield 100mg of hair, which is the optimal sample size for testing. For tests involving EtG, add-ons, or above 10 panels, a sample of 150mg is advised. It's advisable to measure the sample on a jeweler's scale. In cases where scalp hair is not obtainable, a proportionate amount of body hair can be used instead. References to head hair pertain solely to scalp hair, while body hair denotes other types, including facial and axillary hair.
Processing Guide
The drug test result processing in the lab comprises four crucial steps: Accessioning, Screening, Extraction, and Confirmation.
Accessioning deals with the initial entry of a sample into the lab's system, which involves checking proper sealing and shipment, assigning a random Laboratory Accessioning Number (LAN), and completing additional data entries not captured by electronic custody systems.
Screening provides a preliminary assessment for abused drugs. While cost-effective for excluding drug use in most samples, any positive results from Screening must be verified for legal admissibility. Samples that show presumptive positives in Screening must undergo further validation.
In case of a presumptive positive in the Screening phase, additional hair is taken from the initial sample for Extraction. Here, drugs are extracted from hair at significantly lower concentrations compared to other testing methods (like urine or oral fluids), emphasizing hair drug screening's complexity.
Confirmation of positive Screening results is done through methods like GC/MS, GC/MS/MS, or LC/MS/MS. Presumptive positive samples are cleaned before confirmation if necessary. The comprehensive process from Accessioning to Confirmation is under the scrutiny of both CAP (College of American Pathologists) Hair designation and compliance with ISO / IEC 17025 standards.
Benefits of hair drug screening:
Drawbacks:
Note: Although referred to as "hair follicle tests", the analysis focuses on the hair strand itself, not the follicle beneath the skin.
Hair follicle tests surpass urine tests in Franklin, AZ, thanks to superior detection precision and reliability.
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