Urine| Hair Follicle | Oral Fluid | Blood | ETG
Testing with hair has become recognized as an effective means for identifying alcohol and drug usage. Hair captures a history of substances over time, enclosing biomarkers within the strands as the hair grows. When hair is gathered close to the scalp, it offers a detection range of up to around three months for alcohol and drugs. Collecting hair is straightforward, relatively difficult to tamper with, and simple to send.
A sample length of 1.5 inches consisting of about 200 hair strands (approximately the thickness of a #2 pencil) near the scalp will amount to 100mg of hair, which is the optimal specimen size for analysis. For tests like EtG, additional tests, or those exceeding 10 panels, it’s recommended to use 150mg of the sample. We suggest using a jeweler’s scale to weigh the sample. If scalp hair is not obtainable, a similar quantity of body hair may be used. Mentioning head hair refers to scalp hair exclusively. Body hair denotes all other sorts of hair (facial, axillary, etc.).
Process Overview
There are four principal stages in the lab processing of a drug test outcome: Accessioning, Screening, Extraction, and Confirmation.
Accessioning encompasses the initial intake of a specimen into the lab’s framework. This includes ensuring the sample was correctly sealed and delivered, assigning a unique LAN (Laboratory Accessioning Number), and inserting any additional data not supplied by an electronic chain of custody system.
Screening provides an initial quick check for substance abuse. Screening is a cost-effective approach to eliminate drug use on most samples, but a positive screen needs confirmation for legal admissibility. Any samples that flag positive in Screening require a secondary confirmation.
If a sample tests positive in the Screening phase, more hair is taken from the original sample and prepared for Extraction. In this phase, drugs are removed from hair at lower concentrations compared to other methods (e.g., urine or oral fluid), which makes hair drug screening the most challenging method to undertake.
Confirmation of any positive screen result is done through GC/MS, GC/MS/MS, or LC/MS/MS. All presumptive positive samples are cleaned before confirmation as required. The complete laboratory processing from Accessioning to Confirmation is reviewed under both the CAP (College of American Pathologists) Hair designation and the accreditation to ISO / IEC 17025 standards.
Advantages of hair drug testing:
Limitations:
Note: Although often termed as "hair follicle tests", the analysis actually focuses on the hair strand, not the follicle beneath the scalp
Why Hair Testing Prevails Over Urine Testing
Extended Detection Window Advantages
Security with Hair Follicle Testing
Nationwide Access and Local Convenience
Confidentiality in a Simple Process
Cost-Effective and Quick
Precision and Speed in Testing
Ensuring Compliance and Safety