Urine| Hair Follicle | Oral Fluid | Blood | ETG
The utilization of hair testing has emerged as an effective method for identifying alcohol and drug consumption. Hair strands offer an extensive timeline of these substances by capturing biomarkers within the fibers of the growing strands. When extracted near the scalp, hair can reveal a detection window extending up to around three months for both alcohol and drugs. The collection process for hair is straightforward, difficult to tamper with, and simple to transport.
A sample of about 1.5 inches consisting of around 200 hair strands (roughly the width of a #2 pencil) nearest to the scalp yields 100mg, which is the optimal quantity for screening and corroboration. For EtG, additional analyses, and/or tests exceeding 10 panels, 150mg of the specimen is suggested. We recommend utilizing a jeweler’s scale to gauge the specimen’s weight. If scalp hair is unavailable, an equivalent quantity of body hair may be obtained. When mentioning head hair, we specifically refer to scalp hair. In contrast, body hair denotes all other varieties (facial, axillary, etc.).
Process Overview
The laboratory R Accessioning entails the initial integration of a specimen into a laboratory’s framework. This involves ensuring that the specimen was properly sealed and dispatched, assigning an arbitrary LAN (Laboratory Accessioning Number), and concluding any extra data entry absent from an electronic chain of custody mechanism. Screening constitutes an immediate preliminary evaluation for drugs of abuse. Although Screening is a cost-efficient approach to exclude drug consumption for the bulk of specimens, a positive screen mandates confirmation for legal admissibility. Any specimens that show a presumptive positive result in Screening require subsequent confirmation. If a specimen registers a presumptive positive in the screening phase, additional hair is extracted from the primary sample and prepared for Extraction. During this phase, drugs are drawn out from hair at significantly lower concentrations compared to alternative methodologies (e.g., urine or oral fluid), explaining why hair drug screening is among the most challenging methods to execute. Confirmation for any positive screening outcomes is performed using GC/MS, GC/MS/MS or LC/MS/MS. All samples registering a presumptive positive undergo washing before confirmation as necessary. The comprehensive laboratory procedure from Accessioning to Confirmation is scrutinized under both the CAP (College of American Pathologists) Hair designation and the certification to ISO / IEC 17025 standards. Advantages of hair drug testing: Limitations: Note: Although commonly dubbed "hair follicle tests," the analysis targets the hair strand rather than the sub-scalp follicle.
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