Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair analyses are increasingly recognized as an effective means of identifying drug and alcohol consumption. Hair captures long-term records of substances by embedding biomarkers within the hair strand's fibers. When cut near the scalp, hair samples can offer nearly a 3-month timeframe for detecting alcohol and drugs. Hair is easy to collect, relatively hard to tamper with, and simple to transport.
A 1.5-inch section consisting of around 200 strands (roughly the diameter of a #2 pencil) near the scalp yields 100mg of hair, considered an optimal sample for analysis and confirmation. For EtG, extra tests, and/or panels exceeding 10, 150mg of the sample is suggested. Utilizing a jeweler’s scale for specimen weighing is advisable. If scalp hair is not an option, a comparable amount of body hair can be used. When mentioning head hair, we solely refer to scalp hair. Body hair encompasses all other types (facial, axillary, etc.).
Process Overview
The principal stages involved in a lab's drug test processing include Accessioning, Screening, Extraction, and Confirmation.
Accessioning encompasses the initial handling of a sample in a laboratory setup. It verifies the sample was adequately sealed and dispatched, assigns a unique LAN (Laboratory Accessioning Number), and concludes any extra data entry absent from an electronic chain of custody system.
Screening comprises an initial brief examination for drugs of concern. While Screening is a cost-efficient approach to dismiss drug presence in most samples, any positive results must undergo confirmation to be legally valid. Presumptive positive samples in Screening necessitate subsequent confirmation.
If a sample is presumptively positive at the Screening phase, additional hair is taken from the initial sample for Extraction preparation. During this step, drugs are withdrawn from hair at markedly lower levels than other techniques (e.g., urine or oral fluids), underscoring why hair drug testing is notably complex to execute.
GC/MS, GC/MS/MS, or LC/MS/MS is employed for validating any positive screening outcomes. All presumptive positive samples undergo washing before confirmation as deemed necessary. The complete lab sequence from Accessioning through Confirmation operates under the CAP (College of American Pathologists) Hair guidelines and adheres to ISO / IEC 17025 standards for accreditation.
Advantages of hair drug testing:
Limitations:
Note: Although frequently labeled as "hair follicle tests", the test examines the hair strand, not the hair follicle beneath the scalp.
Why Hair Follicle Testing Beats Urine Testing in Holton, KS
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