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Creatine Kinase, Muscle and Brain Type (CK-MB)

Published: August 9, 2026Updated: August 17, 2026

This test measures the CK-MB enzyme, which is produced mainly in the heart and some muscle tissues. It helps assess heart muscle damage or injury.

Quick summary

["CK-MB helps identify heart damage by detecting elevated levels after injury."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
49551-5
Short code
CK MB Bld-mCnc
Synonyms
CK MB Bld-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
22
Ref high
198
Critical range
— – 10000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82553
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order a CK-MB test to check for heart problems, such as a heart attack, after you experience symptoms like chest pain, shortness of breath, or unusual tiredness. It can also be used to monitor heart health in people with known heart conditions or after certain surgeries or procedures.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into a vein in your arm or hand to draw a blood sample. This is usually quick and painless, though you might feel a slight pinch.

What Happens During the Test?

The blood sample is sent to a lab where it is analyzed to measure the CK-MB enzyme levels. The test typically takes a few hours to complete, depending on lab processes.

What Are the Results and When Will I Hear Back?

Results are usually reported as a ratio or concentration of CK-MB relative to other forms of creatine kinase. Your doctor will compare these results to your medical history and symptoms to determine if further action is needed. You’ll hear from your healthcare provider about the results and any next steps.

Reference range

Adult males: 22-198 U/L; Females: 22-198 U/LN/A

Specimen: whole-blood

No special preparation required. Inform provider of any chest pain or symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CK-MB

Frequently asked questions

When might my CK-MB test results be abnormal?
Your CK-MB levels may be higher than usual if you have had a heart attack, heart muscle damage, or certain muscle injuries. Other conditions, such as severe muscle strain or certain infections, can also cause temporary increases. Your doctor will review your symptoms and medical history to understand why the results might be elevated.
What does it mean if my CK-MB levels are normal?
If your CK-MB levels are within the expected range, it suggests there is no significant heart muscle damage at this time. However, this test alone cannot rule out all heart conditions. Your doctor may recommend follow-up tests or monitoring based on your symptoms and overall health.
Can lifestyle changes affect CK-MB levels?
Yes, certain lifestyle factors like intense physical exercise, muscle injuries, or dehydration can temporarily affect CK-MB levels. However, these changes are usually short-term. If you have ongoing symptoms or concerns, discuss them with your doctor to ensure proper evaluation.
  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 17, 2026. · Read our editorial policy