Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair testing is now recognized as an effective means to detect drug and alcohol consumption. Hair offers a prolonged record of substance use by capturing biomarkers in the strands as they grow. When sourced from near the scalp, hair can reveal up to about a 3-month detection period for substances. Collecting hair is easy, hard to tamper with, and simple to transport.
A 1.5-inch segment of roughly 200 strands of hair, comparable in thickness to a #2 pencil and taken nearest to the scalp, provides 100mg of hair, which is optimal for both screening and confirmation. For EtG, additional tests, and/or panels exceeding 10, a specimen amounting to 150mg is advised. We suggest measuring the specimen on a jeweler’s scale. In cases where scalp hair isn't available, a comparable quantity of body hair may be used. By head hair, we specifically mean scalp hair, while body hair encompasses all other types (such as facial, axillary hair, etc.).
Process Overview
There are four primary steps in the lab processing of a drug test result: Accessioning, Screening, Extraction, and Confirmation.
Accessioning pertains to the initial integration of a sample into a lab’s system, ensuring its proper sealing and shipment, generating a random LAN (Laboratory Accessioning Number), and filling in any extra data not entered via an electronic chain of custody system.
Screening conducts an initial rapid test for substances. While Screening serves as a cost-efficient method to eliminate drug usage in most samples, positive results must be confirmed for court use. Samples registering presumptively positive in Screening need further confirmation.
When a sample proves presumptively positive in Screening, additional strands are extracted from the original specimen for the Extraction phase. In Extraction, drugs are removed from hair at a far lower concentration than other methods (such as urine or oral fluid), establishing hair drug testing as the most challenging method to perform.
Any positive screening outcomes undergo Confirmation through GC/MS, GC/MS/MS, or LC/MS/MS. All samples preliminarily positive undergo washing before Confirmation if required. The whole lab process, from Accessioning to Confirmation, is scrutinized under both the CAP (College of American Pathologists) Hair designation and is accredited to ISO / IEC 17025 standards.
Benefits of Hair Drug Testing:
Drawbacks:
Note: Even though commonly called "hair follicle tests," the test examines the hair strand itself, not the hair follicle beneath the scalp.
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