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Fentanyl in Urine (Mass Concentration)

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

This test measures the amount of fentanyl, a powerful opioid pain medication, present in your urine. It helps assess recent exposure or use.

Quick summary

["This test checks for recent opioid use, often used in drug screening or monitoring."]

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

Key facts at a glance

LOINC
11073-4
Short code
Des-Pr-fentanyl Ur-mCnc
Synonyms
Des-Pr-fentanyl Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
86430
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’ve been prescribed fentanyl, suspected of using opioids, or are undergoing treatment for substance use. It can also be part of a broader drug screening, such as for employment, legal reasons, or medical supervision.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample in a private area, typically collected in a clean container. Follow your lab’s instructions for proper collection.

How the Test Works

The test uses a sensitive method (likely immunoassay or chromatography) to detect fentanyl in your urine. It measures the mass concentration of the drug, not its metabolites, to identify recent use.

Results and Interpretation

Results are qualitative (positive/negative) rather than quantitative, meaning they indicate whether fentanyl was detected but not the exact amount. A positive result suggests recent opioid exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Fentanyl

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on the lab’s processing time. Follow-up with your healthcare provider if you have questions about your results.
What does a positive result mean?
A positive result means fentanyl was detected in your urine, indicating recent use. This does not confirm the source or intent behind the use. Your provider will discuss next steps, such as further testing or treatment options.
Can I drink water before the test?
Yes, you can drink water, but avoid excessive fluid intake to ensure a sufficient urine sample. Follow any specific instructions provided by your lab or healthcare team.
  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