Fentanyl in Plasma (24-hour Urine Collection)
This test measures the amount of fentanyl, a powerful opioid pain medication, in your urine over a 24-hour period. It helps assess recent exposure or misuse.
["This test checks for recent opioid use, including misuse, by tracking fentanyl in your urine."]
Key facts at a glance
- LOINC
- 61077-4
- Short code
- fentaNYL Gast Ql
- Synonyms
- fentaNYL Gast Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84484
- SNOMED
- 302774002
- 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 prescribed fentanyl or other opioids, if you’re suspected of opioid misuse, or if you’re undergoing treatment for pain management or addiction. It can also be used to monitor compliance with treatment plans or detect accidental exposure.
What to Expect Before the Test
You’ll need to collect all urine produced in a 24-hour period in a special container. Typically, this starts after you first urinate in the morning of the collection day and continues until you urinate again the following morning. Follow your provider’s instructions carefully to ensure accurate results.
What Happens During the Test
No blood draw is needed for this test. Instead, you’ll provide a full 24-hour urine sample. The sample is then analyzed in a lab to measure the concentration of fentanyl.
What the Results Mean
Results are interpreted based on your clinical situation, such as whether you’re prescribed fentanyl or suspected of misuse. High levels may indicate recent use, while low or absent levels suggest no recent exposure. Your healthcare provider will discuss these results with you in detail.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
24-Hour Urine Fentanyl
Frequently asked questions
How long does it take to get my test results?
Can I drink alcohol before this test?
What if I miss any urine during the collection period?
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 17, 2026. · Read our editorial policy