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Serum Norfentanyl Concentration (Mass Concentration)

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

This test measures the amount of norfentanyl, a synthetic opioid, in your blood. It may be used to assess exposure, monitor treatment, or evaluate overdose risk.

Quick summary

["This test helps doctors track opioid levels for medical or safety reasons."]

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

Key facts at a glance

LOINC
74137-1
Short code
Norfentanyl SerPlBld Cfm-mCnc
Synonyms
Norfentanyl SerPlBld Cfm-mCnc
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 Is This Test Done?

Your healthcare provider may order this test if you’re taking norfentanyl medications, experiencing suspected overdose, or being monitored for substance use. It can also help determine the effectiveness of treatment or assess potential risks in certain settings, such as medical detoxification or legal evaluations.

What to Expect Before the Test

No special preparation is typically needed. You may be asked to fast before the test, but this depends on your provider’s instructions. Bring any medications you’re currently taking to your appointment.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis. The process usually takes a few minutes.

What Are the Results Mean?

Results show the amount of norfentanyl in your blood, measured in micrograms per milliliter (mcg/mL). Higher levels may indicate recent use, overdose, or other medical conditions requiring attention. Your provider will interpret results based on your specific situation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Norfentanyl Level

Frequently asked questions

What does this test measure?
This test measures the concentration of norfentanyl, a potent opioid analgesic, in your blood. It helps assess exposure, guide treatment decisions, or evaluate overdose risk. Levels can vary based on factors like dosage, metabolism, and time since last use.
How soon after use can results be accurate?
Results may reflect recent norfentanyl exposure, but timing depends on how long ago you used it. Blood levels can peak within hours and decline over days. Your provider will consider this when interpreting results alongside other factors.
Can this test detect other opioids?
This test specifically measures norfentanyl. If you’re concerned about other opioids, additional tests may be needed. Always discuss your full substance use history with your healthcare provider.
  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