Marijuana Metabolite (THC)
- Sample Type
- Standard
- Fasting
- No
- Unit
- ng/mL
This test measures the primary inactive metabolite of Tetrahydrocannabinol (THC), specifically 11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH), in the urine. As part of a DOA 5-Panel, it is used to screen for cannabis consumption. Because THC is lipophilic, it is stored in fat cells and released slowly, allowing for a detection window ranging from a few days for occasional users to several weeks for chronic users. It identifies exposure rather than acute impairment.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
False positives, though rare with modern immunoassays, can occur due to cross-reactivity with certain non-steroidal anti-inflammatory drugs (NSAIDs) or proton pump inhibitors. Furthermore, 'passive inhalation' is a common legal defense, though it rarely reaches the standard 50 ng/mL cutoff. A second opinion or confirmatory GC/MS (Gas Chromatography-Mass Spectrometry) is essential for legal or employment-terminating results.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Marijuana Metabolite (THC):
Official Sources
- Cannabis Use Disorder - StatPearls - NCBI Bookshelfncbi.nlm.nih.gov
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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