Fentanyl Concentration in Serum (Quantitative)
This test measures the amount of fentanyl, a powerful opioid pain medication, in your blood serum. It helps assess drug exposure, toxicity, or therapeutic levels.
["Fentanyl levels help doctors monitor pain management or detect potential overdoses."]
Key facts at a glance
- LOINC
- 97285-1
- Short code
- Norfentanyl TissCo Ql Cfm
- Synonyms
- Norfentanyl TissCo Ql Cfm
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- confirm
- CPT
- 86430
- 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’re taking fentanyl for pain relief, if you’ve experienced symptoms like confusion, slow breathing, or unusual drowsiness, or if you’re suspected of an opioid overdose. It can also be used in medical settings to guide dosing or assess drug interactions.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. The process usually takes a few minutes. If you’re on blood thinners, let your provider know beforehand.
What the Test Results Mean
Results are reported in nanograms per milliliter (ng/mL) or micrograms per liter (µg/L). High levels may indicate overdose, misuse, or improper dosing, while therapeutic levels confirm safe pain management. Always discuss results with your doctor.
Common Symptoms to Watch For
Fentanyl overdose symptoms include extreme drowsiness, shallow breathing, blue lips or fingernails, loss of consciousness, or vomiting. Seek emergency help immediately if you or someone else shows these signs.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated fentanyl levels may signal overdose, drug diversion, or improper administration. Low therapeutic levels could indicate inadequate pain control. This test is critical in pain management, addiction treatment, and forensic toxicology to guide clinical decisions and ensure patient safety.
Short name
Fentanyl Level
Frequently asked questions
How long does it take to get my fentanyl test results?
Can I drink water before this test?
Will this test show up on a drug screen?
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