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Cannabinoid (THC and metabolites) Screening in Urine

Published: August 9, 2026Updated: August 16, 2026

This test detects the presence of cannabinoids, including tetrahydrocannabinol (THC) and its metabolites, in your urine. It helps assess recent or past cannabis use.

Quick summary

["This test checks for cannabis use, often required for employment, legal purposes, or medical evaluation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
31080-5
Short code
Cannabinoids Mec Ql Scn
Synonyms
Cannabinoids Mec Ql Scn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
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 to screen for recent cannabis use, especially if you’re applying for jobs that prohibit drug use, facing legal issues related to cannabis, or need to confirm abstinence for medical reasons. It can also be part of a broader substance use evaluation.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample in a private area at a lab or clinic. Avoid drinking alcohol or consuming certain medications that could affect results.

What the Test Measures

The test measures cannabinoids, including THC and its metabolites (like THC-COOH), which remain in urine for days to weeks after use. This helps determine if cannabis was recently consumed.

Possible Results and Interpretation

A positive result indicates recent cannabis use, while a negative result suggests no detectable cannabinoids in your urine. However, results can vary based on frequency of use, metabolism, and other factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Cannabinoid screening is critical in workplaces, legal proceedings, and medical settings to ensure compliance with substance-free policies. It can also guide treatment plans for substance use disorders. False positives may occur due to cross-reacting substances, so confirmatory testing may be needed.

Short name

Urine Cannabinoid Screen

Frequently asked questions

Will this test show if I’ve used cannabis recently?
Yes, this test detects recent cannabis use by measuring cannabinoids in your urine. It can identify use within days to weeks, depending on how often you use.
What if my test is positive?
A positive result means cannabis was detected in your urine. Your healthcare provider or employer will discuss next steps, which may include retesting or further evaluation to understand the cause.
Can I drink alcohol before this test?
Avoid alcohol for 24 hours before testing, as it may affect urine composition and potentially interfere with results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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