Urine| Hair Follicle | Oral Fluid | Blood | ETG
The use of hair testing has emerged as a robust method for identifying drug and alcohol consumption. Hair captures a prolonged record of alcohol and drug use by embedding biomarkers within the fiber of the growing hair. When hair is cut close to the scalp, it can reveal up to a three-month period of alcohol and drug usage. Hair is easy to gather, tough to tamper with, and convenient to send.
A sample measuring 1.5 inches, consisting of approximately 200 strands (roughly the width of a #2 pencil) nearest to the scalp, typically yields 100mg of hair, which is ideal for analysis. For EtG, additional tests, and/or panels exceeding ten, a 150mg specimen is advised. It's best to weigh the specimen with a jeweler’s scale. In the absence of scalp hair, an equivalent amount of body hair may be taken. When mentioning head hair, it specifically refers to scalp hair, while body hair encompasses all other hair types (facial, armpit, etc.).
Process Overview
The lab processing of a drug test result primarily involves four stages: Accessioning, Screening, Extraction, and Confirmation.
Accessioning marks the initial step wherein a sample is introduced into the lab's system. This includes confirming that the sample has been correctly sealed and dispatched, assigning it a unique LAN (Laboratory Accessioning Number), and finishing any supplementary data entry absent from an electronic chain of custody setup.
Screening offers an initial, rapid assessment for substance abuse. It serves as an economical method to dismiss drug usage in most samples, but a positive result needs verification to be valid in legal proceedings. Any sample deemed presumptively positive during Screening necessitates another round of confirmation.
If a sample yields a presumptively positive result during Screening, additional hair is extracted from the initial specimen and processed for Extraction. At this stage, drugs are extracted from hair in lower concentrations compared to other techniques (e.g., urine or oral fluids), rendering hair drug testing the toughest to execute.
Confirmation of any positive Screening outcome is executed using GC/MS, GC/MS/MS, or LC/MS/MS. Samples that appear presumptively positive undergo washing if necessary before confirmation. The entire lab procedure, from Accessioning to Confirmation, undergoes review under CAP (College of American Pathologists) Hair criteria and ISO / IEC 17025 standards accreditation.
Advantages of hair drug testing:
Limitations:
Note: Commonly termed "hair follicle tests," the actual analysis examines the hair strand itself, not the follicle beneath the scalp.
Advantages of Hair over Urine Testing
Unmatched Reliability
Extended Drug Detection Capabilities
Long-Term Substance Monitoring
Enhanced Security in Sample Collection
Reliable and Unquestioned Results
Nationwide Coverage for Convenient Testing
Local and Efficient Testing Solutions
Simplified Testing Processes
Confidential and User-Friendly
Competitive Pricing with Quick Response
Cost-Effective Drug Testing Solutions
Speed and Precision in Drug Testing
Efficient Testing Solutions
Ensuring Workplace Safety and Compliance
Peace of Mind for Employers