Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair testing is recognized as an effective means for identifying drug and alcohol consumption. Hair retains a lengthy record of alcohol and drug usage by capturing biomarkers within the fibers of the growing hair. When cut near the scalp, it can provide a detection timeline for a period of up to approximately 3 months for alcohol and drugs. Collecting hair is straightforward, relatively hard to alter, and simple to transport.
A sample measuring 1.5 inches consisting of about 200 hair strands (similar in dimension to a #2 pencil) nearest to the scalp yields 100mg of hair, which is the preferred sample size for both screening and confirmation. For EtG additions, and/or tests exceeding 10 panels, 150mg of the sample is advised. We suggest using a jeweler’s scale to weigh the sample. Should scalp hair be unavailable, an equivalent quantity of body hair may be used. When discussing head hair, we specifically mean scalp hair. Body hair encompasses all other hair categories (facial, axillary, etc.).
Process Overview
The four fundamental steps in lab processing of a drug test are Accessioning, Screening, Extraction, and Confirmation.
Accessioning involves the preliminary processing of a sample within a laboratory's system, ensuring proper sealing and shipping, assigning a random LAN (Laboratory Accessioning Number), and finishing any extra data entry not provided through an electronic chain of custody.
Screening is a preliminary rapid inspection for drugs of abuse. Though Screening is an affordable way to dismiss drug use in most samples, any positive screen requires confirmation for court submission. Samples testing presumptively positive at Screening necessitate a secondary confirmation.
If a sample turns out presumptively positive during Screening, additional hair is extracted from the original sample and prepared for Extraction. In this phase, drugs are drawn from hair at a lesser concentration than other methodologies (e.g., urine or oral fluid), hence hair drug screening is the most challenging methodology to accomplish.
Confirmation of any positive screening outcome is conducted via GC/MS, GC/MS/MS or LC/MS/MS techniques. All presumptive positive samples undergo washing as required prior to confirmation. The entire lab procedure from Accessioning through Confirmation is scrutinized under CAP (College of American Pathologists) Hair designation and is accredited to ISO / IEC 17025 standards.
Advantages of hair drug testing:
Limitations:
Note: Although often termed as "hair follicle tests", the examination actually analyzes the hair strand rather than the follicle beneath the scalp.
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