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Creatine Kinase MB (CK-MB)

Published: July 27, 2026Updated: August 25, 2026

CK-MB is a cardiac biomarker that measures the level of creatine kinase myocardial band in the blood, primarily used to detect damage to heart muscle cells.

Quick summary

CK-MB helps diagnose heart muscle damage, particularly in acute myocardial infarction.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
ng/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche CK-MB, Abbott CK-MB, Siemens CK-MB
interpretation: {"text":"0–5 ng/mL: No significant heart muscle damage detected.","label":"Normal"}; {"text":">5 ng/mL: Possible heart muscle damage, further evaluation required.","label":"Elevated"}

Creatine Kinase MB (CK-MB) is an enzyme found predominantly in heart muscle cells. When there is damage to these cells, such as in a heart attack, CK-MB is released into the bloodstream.

The CK-MB test is a diagnostic tool used to measure the levels of this enzyme in the blood. Elevated levels can indicate myocardial infarction or other forms of heart muscle damage.

While CK-MB was once the primary biomarker for diagnosing heart attacks, it has largely been supplanted by troponin tests, which are more specific and sensitive. However, CK-MB is still useful in certain clinical scenarios.

Frequently asked questions

What is the normal range for CK-MB?
The normal range for CK-MB is typically 0–5 ng/mL.
How quickly does CK-MB rise after a heart attack?
CK-MB levels typically begin to rise within 3-12 hours of a heart attack, peak at 24 hours, and return to normal within 48-72 hours.
  1. 1
    American Heart AssociationSource
  2. 2
    Mayo ClinicSource

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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 25, 2026. · Read our editorial policy