Skip to content

Norfentanyl Concentration in Serum/Plasma

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

This test measures the amount of norfentanyl, a metabolite of fentanyl, in your blood. It helps assess exposure to fentanyl-related substances.

Quick summary

["This test helps doctors monitor potential fentanyl exposure or misuse."]

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

Key facts at a glance

LOINC
77775-5
Short code
Norfentanyl CtO Ur Cfm-mCnc
Synonyms
Norfentanyl CtO Ur Cfm-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
confirm
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 Might Be Ordered

Your healthcare provider may recommend this test if you’ve been exposed to fentanyl or other opioids, if you’re taking fentanyl-related medications, or if you’re suspected of fentanyl misuse. It can also be used in forensic or toxicology investigations to detect recent drug use.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re taking blood from a catheter, you may need to rest for a few minutes afterward.

What the Test Results Mean

Results show the concentration of norfentanyl in your blood. Higher levels may indicate recent exposure to fentanyl or its metabolites. Your doctor will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is often used in emergency settings to confirm opioid poisoning, in drug screening programs, or to assess compliance with treatment plans for opioid dependence.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Norfentanyl is a key metabolite of fentanyl and appears in the blood shortly after exposure. Detecting it can help confirm recent fentanyl use, guide treatment decisions, or support legal or medical investigations. Levels may vary based on metabolism, dose, and time since exposure.

Short name

Norfentanyl Level

Frequently asked questions

What does a norfentanyl test measure?
This test measures the amount of norfentanyl, a breakdown product of fentanyl, in your blood. It helps healthcare providers assess exposure to fentanyl or related opioids.
How long does it take to get test results?
Results are typically available within 1–3 business days, depending on your lab and testing process. Your doctor will contact you once results are ready.
Can I drink water before this test?
Yes, you can drink water as needed, but avoid alcohol or caffeine before the blood draw, as they may affect 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