Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair analysis is now recognized as an effective method for identifying drug and alcohol consumption. It offers an extended timeline of substance use, capturing biomarkers within the hair's developing fibers. When sampled near the scalp, hair can indicate substance ingestion for up to a 3-month period. Hair collection is straightforward, challenging to tamper with, and convenient to transport.
A sample measuring 1.5 inches of roughly 200 hair strands (equal to the thickness of a #2 pencil) from the scalp yields 100mg, the optimal quantity for analysis and validation. For EtG, additional tests, or panels exceeding 10, a specimen of 150mg is suggested. We advise using a jeweler’s scale for accuracy. If scalp hair is inaccessible, a similar amount of body hair is acceptable. "Head hair" refers exclusively to scalp hair. "Body hair" includes all other types (facial, axillary, etc.).
Process Overview
The drug test lab process includes four key stages: Accessioning, Screening, Extraction, and Confirmation.
Accessioning is the initial stage where a sample is entered into the lab's system, ensuring it was sealed and shipped correctly, assigning a unique LAN (Laboratory Accessioning Number), and completing any data input not covered by an electronic chain of custody.
Screening is the preliminary test for drug presence. Although Screening is cost-efficient for negating drug use in most cases, positive results require confirmation for court validity. Samples that test positive during Screening need a follow-up confirmation.
For presumptive positives in Screening, additional hair is retrieved from the sample for Extraction. Here, drug residues are extracted at significantly lower levels than urine or oral fluid tests, making hair testing notably challenging.
Positive Screening confirmations utilize GC/MS, GC/MS/MS, or LC/MS/MS methods. All presumptive positives are cleaned before final validation. The lab procedure from Accessioning to Confirmation is scrutinized under CAP (College of American Pathologists) Hair designation and ISO / IEC 17025 accreditation standards.
Benefits of hair drug testing:
Drawbacks:
Note: Generally termed "hair follicle tests," the analysis actually assesses the hair strand, not the follicle under the scalp.
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