Urine| Hair Follicle | Oral Fluid | Blood | ETG
Recognized as an effective means for identifying drug and alcohol consumption, hair testing delivers an extensive history of usage by capturing biomarkers within the hair fiber. When hair is collected near the scalp, it provides a detection horizon extending up to three months for alcohol and drugs. This method of collection is straightforward, challenging to tamper with, and simple for shipping.
To obtain an optimal sample for analysis, a 1.5-inch segment consisting of roughly 200 hairs—comparable to a #2 pencil in size—closest to the scalp is recommended, yielding approximately 100mg. For tests involving EtG, additional analyses, or those surpassing 10 panels, a 150mg specimen is advised. Measuring the sample with a jeweler’s scale ensures accuracy. Should scalp hair be unobtainable, a comparable volume of body hair is permissible. References to head hair pertain solely to scalp hair, while body hair encompasses all other types (facial, axillary, etc.).
Process Overview
The drug test laboratory processing includes four primary steps: Accessioning, Screening, Extraction, and Confirmation.
Accessioning denotes the beginning phase where a sample is integrated into the laboratory system. It involves confirming secure sealing and shipping, assigning a random Laboratory Accessioning Number (LAN), and completing any necessary data entry not provided by an electronic chain of custody system.
Screening serves as an initial scan for drugs of abuse. Although cost-effective for ruling out drug use across most samples, a positive screening results require confirmation for legal validity. Samples with presumptive positive results in screening necessitate additional confirmation.
In the event of a presumptive positive in Screening, additional hair is extracted from the specimen for the Extraction phase. Drugs are extracted from hair in significantly lower concentrations than other methods (e.g., urine or oral fluid), which makes hair drug testing a particularly challenging methodology.
Confirming a positive screening outcome is executed through GC/MS, GC/MS/MS, or LC/MS/MS. Presumptive positive samples undergo washing before confirmation as needed. From Accessioning to Confirmation, the laboratory process is scrutinized under both the CAP (College of American Pathologists) Hair criterion and ISO / IEC 17025 accreditation standards.
Advantages of hair drug testing:
Limitations:
Note: Although frequently called "hair follicle tests," the analysis focuses on the hair strand, not the follicle beneath the scalp.
Why Hair Follicle Testing Excels Above Urine Testing in Ojo Feliz, NM
When comparing testing methods, hair follicle testing stands out remarkably against traditional urine tests. It's not just the breadth of its detection period; it also offers superior reliability. While urine tests might reveal recent usage, hair tests encompass months of substance use history, offering decisive insights.
Extended Detection Window in Ojo Feliz, NM
Tamper-Resistant Testing Method in Ojo Feliz, NM
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