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Cannabinoid (THC and metabolites) screening in urine

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

This test detects the presence of THC (tetrahydrocannabinol) and its metabolites in your urine to screen for recent cannabis use.

Quick summary

["This test helps determine if cannabis was recently used, often used in workplace or legal testing programs."]

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

Key facts at a glance

LOINC
109831-8
Short code
Cannabinoids Msmt Mec
Synonyms
Cannabinoids Msmt Mec
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 cannabis recently, if you’re required for employment, or if you’re part of a program monitoring substance use. It helps assess compliance with policies or identify exposure to cannabis.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample in a private area, similar to other urine tests. Wear comfortable clothing and plan to spend about 10 minutes.

What the Test Results Mean

A positive result means THC or its metabolites were detected, indicating recent cannabis use. A negative result means no detectable amounts were found. Results are qualitative (yes/no) rather than showing exact amounts.

Possible Results and Next Steps

If positive, follow-up testing (like a confirmatory urine test) may be needed to confirm the result. If negative, no further action is typically required unless your provider has other concerns.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Cannabinoid Screen

Frequently asked questions

What does a positive result mean?
A positive result means THC or its metabolites were found in your urine, suggesting recent cannabis use. This does not necessarily mean you were impaired at the time of testing, as THC can remain in the body for days or weeks.
How long does it take to get results?
Results are usually available within 1 to 3 business days, depending on lab processing times. Your healthcare provider will contact you with the outcome once it’s ready.
Can I drink water before the test?
Yes, you can drink water before the test, but avoid excessive fluid intake to ensure a sufficient urine sample. Do not drink alcohol or other substances that might affect the test 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