24-Hour Urine Fentanyl Concentration (Mass Concentration)
This test measures the amount of fentanyl, a powerful opioid pain medication, in your urine over a 24-hour period. It helps assess exposure to fentanyl, often used in pain management or detected in drug testing.
["This test helps track opioid use or potential contamination in your system over time."]
Key facts at a glance
- LOINC
- 26867-2
- Short code
- fentaNYL 24h Ur-aCnc
- Synonyms
- fentaNYL 24h Ur-aCnc
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 Is This Test Done?
Your healthcare provider may order this test if you’ve been prescribed fentanyl, if you’re suspected of fentanyl exposure (e.g., from environmental sources or misuse), or if you’re part of a drug screening program. It can also be used to monitor compliance with treatment plans or detect accidental contamination in certain workplaces or settings.
What Does the Result Mean?
Results are not provided with specific reference ranges since they depend on context (e.g., prescribed dose, suspected misuse, or environmental exposure). High levels may indicate recent use, misuse, or accidental exposure. Low or absent levels suggest no detectable recent exposure. Always discuss results with your provider.
Sample Collection and Preparation
You’ll collect all urine produced in a 24-hour period (typically from midnight to midnight) in a clean container. Your provider will give detailed instructions. The sample is sent to a lab for analysis using a sensitive detection method to measure fentanyl concentration.
What Happens During the Test?
No special preparation is needed beyond collecting the urine sample as directed. The lab analyzes the sample for fentanyl using a technique like high-performance liquid chromatography (HPLC) or immunoassay, which detects even small amounts of the drug.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for identifying fentanyl exposure in clinical, occupational, or research settings. Elevated levels may signal misuse, accidental ingestion, or environmental contamination. It supports treatment decisions, workplace safety protocols, or legal evaluations. However, false positives can occur with certain medications or substances, so results should be interpreted alongside clinical context.
Short name
24-Hour Urine Fentanyl
Frequently asked questions
What if I’m Taking Prescribed Fentanyl?
How Long Does It Take to Get Results?
Can I Drink Alcohol or Other Medications Before the Test?
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