Urine| Hair Follicle | Oral Fluid | Blood | ETG
Hair analysis is now regarded as an effective method for assessing both drug and alcohol consumption. Hair captures a lasting record of alcohol and drug usage by embedding biomarkers within the fibers of the hair as it grows. When obtained near the scalp, hair can reveal up to around a 3-month period of alcohol and drug presence. Hair collection is straightforward, relatively hard to tamper with, and simple to transport.
A 1.5-inch segment of roughly 200 hair strands (akin to the size of a #2 pencil) nearest to the scalp will yield 100mg, which is ideal for screening and confirmation. For EtG, additional tests, and/or tests exceeding 10 panels, a 150mg sample is preferable. We advise using a jeweler’s scale to measure the sample. If scalp hair isn't available, an equivalent amount of body hair can be utilized. The term head hair specifically denotes scalp hair, while body hair encompasses all other hair types (like facial or axillary).
Process Overview
The laboratory processing of a drug test comprises four primary stages: Accessioning, Screening, Extraction, and Confirmation.
Accessioning entails the initial integration of a specimen into the lab’s system. This step involves checking the proper sealing and shipping of the sample, allocating a random LAN (Laboratory Accessioning Number), and completing any supplementary data entry not covered by an electronic chain of custody system.
Screening provides a preliminary assessment for drugs of abuse. Although Screening is a cost-efficient method to eliminate drug usage in the bulk of samples, any positive results must be confirmed for legal admissibility. Any samples presumed positive in the Screening phase necessitate further confirmation.
Should a sample indicate presumptive positivity during Screening, additional hair from the initial sample is processed for Extraction. Here, drug substances are isolated from the hair at much lower concentrations than seen in other testing approaches (such as urine or oral fluid), which makes hair drug testing a complex technique.
For confirming a positive screening outcome, methods such as GC/MS, GC/MS/MS, or LC/MS/MS are employed. All samples with presumptive positivity undergo washing before confirmation if required. The complete laboratory procedure from Accessioning to Confirmation is scrutinized under both the CAP (College of American Pathologists) Hair designation and ISO / IEC 17025 accreditation standards.
Advantages of hair drug testing:
Limitations:
Note: Although frequently termed as "hair follicle tests", this test evaluates the hair strand, not the follicle beneath the scalp.
Why does hair follicle testing outshine urine testing in Guide Rock, NE? Hair testing offers superior accuracy and reliability compared to traditional urine tests. While urine tests detect recent drug use, hair tests unveil a longer-term consumption pattern.
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