A hair follicle drug test analyzes a small hair sample collected close to the scalp to detect drugs and their metabolites embedded in the hair shaft. Because hair grows approximately ½ inch per month, a 1.5-inch sample reflects up to 90 days of drug use history.
This method is widely used when accuracy, long-term detection, and resistance to tampering are required.
Hair follicle testing offers distinct advantages over urine, saliva, and blood testing:
Detects drug use over 90 days, compared to:
- Urine: Detect 1-7 days
- Saliva: Detect 24-72 hours
- No restroom access required
- Hair can be collected from the scalp or body if needed
- Chain-of-custody procedures ensure integrity
- Identifies patterns of habitual drug use
- Reduces false negatives from short-term abstinence
- Simple hair collection
- No bodily fluids involved
Our hair follicle lab tests can screen for:
- Marijuana (THC)
- Cocaine & benzoylecgonine
- Opiates (heroin, morphine, codeine, oxycodone)
- Amphetamines & methamphetamines
- PCP
- Benzodiazepines (Xanax, Valium, Ativan)
- Barbiturates
- Synthetic Cannabinoids
- Synthetic stimulants (cathinones)
- Synthetic opioids (including fentanyl)
- Ketamine & propoxyphene
Panel options range from 5-panel to expanded multi-panel tests.
Yes. Hair drugtesting is considered one of the most reliable drug testing methods when performed by certified laboratories.
- Advanced lab confirmation (GC/MS or LC/MS)
- MRO review of all non-negative results
- Differentiation between environmental exposure and actual drug use
- Established cutoff levels to minimize false positives
- Hair treatments may slightly affect concentration levels
- Very infrequent drug use may not always be detected
- Results are best interpreted with MRO oversight
At US Health Testing, all results are processed through CLIA-certified laboratories and reviewed by a Medical Review Officer for accuracy and compliance.
Employers commonly use hair testing for:
- Pre-Employment Screening
- Random Drug Testing
- Post-Accident Investigations
- Reasonable Suspicion Testing
- Return-to-Duty Testing
Employers should ensure testing aligns with federal and state drug testing laws. Our team can assist with policy guidance.
Negative result: Drug levels below established cutoffs
Positive result: Indicates drug use within the detection window
Inconclusive results are rare and reviewed by an MRO
Confidentiality and secure handling of results are maintained at every stage.
If you're searching for hair follicle drug test near me, hair drug testing labs near me, or hair follicle lab test, US Health Testing offers fast access to certified labs across the USA.
Order drug tests online today and visit nearby lab locations for sample collection.
