Cannabinoid Mass Concentration in Urine (Screening)
This test measures the presence of cannabinoids, the active compounds found in marijuana, in your urine. It helps determine if you’ve recently used cannabis.
["This test screens for recent marijuana use via urine cannabinoid levels."]
Key facts at a glance
- LOINC
- 27024-9
- Short code
- Cannabinoids Mec-mCnt
- Synonyms
- Cannabinoids Mec-mCnt
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you’ve been suspected of using marijuana, if you’re required to submit to drug testing (e.g., for employment, legal reasons, or treatment programs), or if you’re experiencing symptoms that could be linked to cannabis use, such as changes in mood, sleep, or behavior. It can also be part of a broader substance use evaluation.
How the Test Works
The test uses a urine sample to detect cannabinoids, primarily THC (tetrahydrocannabinol) and its metabolites, which remain in the body for days to weeks after use. High-performance liquid chromatography (HPLC) or immunoassay methods are commonly used to measure these compounds.
Sample Collection and Preparation
You’ll provide a urine sample, typically collected in a sterile container. The sample is then sent to a lab for analysis. No special preparation is needed, but you may be asked to follow certain instructions, such as avoiding cannabis use before testing if it’s a recent-use assessment.
What to Expect During the Test
The test is quick and painless. You’ll likely be asked to provide a urine sample in a clinic, hospital, or at home (if using a home test kit). Results are usually available within hours to a few days, depending on the lab’s processing time.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Urine Cannabinoid Screen
Frequently asked questions
This test is primarily used for screening purposes, not for diagnosing medical conditions. Positive results indicate recent cannabis use but do not confirm the type, amount, or duration of use. It’s important to discuss the results with your healthcare provider, especially if you’re concerned about substance use or have underlying health issues.
Results typically arrive within a few hours to a few days, depending on the lab’s workflow. Home test kits may provide results immediately, but lab results often require follow-up from your healthcare provider.
Yes, false positives are possible, especially if you’ve recently consumed other substances that can interfere with the test or if the sample was improperly collected. Your provider can clarify the results and discuss next steps if needed.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy