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Myoglobin in Serum (or Plasma)

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

Myoglobin is a protein found in muscle cells that helps carry oxygen. It can leak into your bloodstream after muscle damage, such as from a heart attack, injury, or exercise.

Quick summary

["This test helps doctors check for muscle injury or heart-related issues."]

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

Key facts at a glance

LOINC
30873-4
Short code
MRA Forearm ves
Synonyms
MRA Forearm ves
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr-angio
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 doctor may order this test if you have symptoms like chest pain, shortness of breath, or unexplained muscle weakness. It’s also used to monitor conditions like heart attacks, muscle injuries, or certain diseases that affect muscles.

What to Expect Before the Test

You may need to fast for a few hours before the test, but your doctor will let you know. Bring any medications you’re taking, as some can affect results. Avoid strenuous activity 24 hours before testing.

How the Test Is Done

A healthcare provider will draw blood from a vein in your arm. You might feel a small pinch, but it usually doesn’t cause discomfort. The blood is then sent to a lab for testing.

What the Results Mean

High levels of myoglobin in your blood can signal muscle damage or heart problems. Low levels are usually normal, but your doctor will interpret results based on your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Myoglobin Level

Frequently asked questions

How often do I need this test?
This test is typically done as needed, depending on your symptoms or medical condition. Your doctor will determine how often you need it based on your specific situation.
Can I eat or drink before the test?
Your doctor or lab will provide specific instructions, but generally, you may eat a light meal if needed, but avoid heavy or fatty foods. Some labs recommend fasting for a few hours before testing.
What are the normal ranges for this test?
There are no standard numeric reference ranges provided here since they can vary by lab and patient factors. Your doctor will use the results in relation to your health status and symptoms.
  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