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Serum morphine concentration (mass concentration)

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

This test measures the amount of morphine present in your blood. It may be used to monitor drug levels, assess toxicity, or evaluate therapeutic effectiveness.

Quick summary

["This test helps track how your body processes morphine, whether for pain relief or other medical uses."]

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

Key facts at a glance

LOINC
27206-2
Short code
Morphine Free Vitf-mCnc
Synonyms
Morphine Free Vitf-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your healthcare provider may request this test if you’re taking morphine or related medications, experiencing symptoms like drowsiness, confusion, or respiratory issues, or if you’re undergoing treatment for opioid dependence. It could also be part of a broader evaluation for overdose or drug interaction monitoring.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear a comfortable shirt for easy access to your arm.

What Happens During the Test

A healthcare professional will insert a small needle into your vein (usually in your arm) to draw a blood sample. You may feel a slight pinch, but the procedure takes only a few minutes. The blood is then sent to a lab for analysis.

What the Results Mean

Results are typically reported in micrograms per milliliter (µg/mL). High levels may indicate overdose, improper dosing, or drug misuse. Low levels could suggest poor absorption, metabolism issues, or recent drug withdrawal. Always discuss results with your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Morphine blood level

Frequently asked questions

How long does it take to get results?
Results are usually available within 1–3 business days, depending on your lab’s processing time. Your provider will contact you once they’re ready to review them with you.
Can I eat or drink before this test?
If your blood is drawn in the morning, avoid food for 8–12 hours and water for 1 hour before testing. If drawn later, follow your provider’s specific instructions.
Is there any risk or discomfort involved?
Most people experience only mild discomfort or bruising at the injection site. Rarely, there may be swelling or a small bruise. If you have a bleeding disorder or are on blood thinners, inform your provider beforehand.
  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