Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair sample analysis is increasingly recognized as an effective means for identifying drug and alcohol consumption. The hair fibers, as they grow, trap biomarkers, offering an extended timeline for detecting substances. Sampling hair near the scalp can reveal drug and alcohol use for up to approximately three months. Collecting hair is straightforward, difficult to tamper with, and convenient to transport.
Collecting a sample 1.5 inches long with about 200 hairs (equivalent to the width of a #2 pencil) from the scalp provides 100mg of hair, which is optimal for both screening and confirmation. For analyses like EtG, extensions, or tests going beyond 10 panels, 150mg is advised. It is suggested to weigh the sample using a jeweler’s scale. In cases where scalp hair is unavailable, an equivalent volume of body hair is acceptable. "Head hair" specifically denotes scalp hair, while "body hair" encompasses all other types, including facial and axillary hair.
Process Overview
There are four primary steps in laboratory drug test processing: Accessioning, Screening, Extraction, and Confirmation.
Accessioning entails the initial handling of a sample into a laboratory’s system. This process includes ensuring the sample was properly sealed and sent, assigning a random LAN (Laboratory Accessioning Number), and completing any outstanding data entry not handled by an electronic custody chain system.
Screening involves a preliminary rapid assessment for substance abuse. Although Screening is an economical method for ruling out drug use in most samples, results must be confirmed to be court-admissible. Any samples that test presumptively positive in Screening necessitate further confirmation.
If a sample shows a presumptive positive during the Screening stage, additional hair is extracted from the primary sample for Extraction. This step isolates drugs from the hair in lower concentrations than other methods such as urine or oral fluid, making hair drug screening a challenging process.
Positive results from screening are confirmed via GC/MS, GC/MS/MS, or LC/MS/MS. All presumptive positive samples undergo washing prior to confirmation when necessary. The end-to-end lab process from Accessioning to Confirmation undergoes review under both the CAP (College of American Pathologists) Hair classification and ISO / IEC 17025 accreditation standards.
Benefits of hair drug testing:
Limitations:
Note: While commonly called "hair follicle tests", the actual test examines the hair strand, not the follicle beneath the scalp.
Discover why hair follicle testing outshines urine analysis in Potterville, MI. Hair tests offer a far superior detection period, tracing drug use over a longer span. Their reliability stems from a significantly extended detection window compared to urine tests, providing more conclusive evidence. Clients benefit from accurate and dependable results, improving the quality of screening processes.
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