Interpret Your Creatine Kinase-MB Results
Enter your CK-MB value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
Medical Disclaimer
This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.
Always consult a qualified healthcare professional before making any health decisions. Read full disclaimer →
Creatine Kinase-MB Normal Ranges
CK-MB is an isoenzyme of creatine kinase found predominantly in cardiac muscle.
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 0 – 25 | U/L | — |
Also reported in: %.
Why Doctors Order the Creatine Kinase-MB Test
CK-MB has largely been replaced by high-sensitivity troponin for MI diagnosis, which is more specific and sensitive.
How to Enter Your CK-MB Result
Creatine Kinase-MB can be reported in U/L or %. Choose the unit printed next to your result on the lab report so it is compared with the matching reference range.
What a Low or High CK-MB Can Be Associated With
Below the reference range
- Not clinically significant (low or undetectable is normal)
Above the reference range
- Acute myocardial infarction
- Myocarditis
- Cardiac surgery or cardioversion
- Skeletal muscle trauma (when total CK is also very high)
- Rhabdomyolysis (a small amount of CK-MB is in skeletal muscle)
These are common associations, not a diagnosis. A single result is read alongside your symptoms, history and other tests — discuss it with your doctor.
What Can Change Your CK-MB Result
Before you read too much into a result, consider whether any of these applied:
- Skeletal muscle injury with high CK-MB fraction (macro-CK, athlete training)
- Hemolysis
- Myopathy (some skeletal muscle diseases express CK-MB)
Preparing for the test: No special preparation. Serial measurements are most useful — typically at 0, 6, and 12 hours in suspected MI.
Symptoms That Often Prompt CK-MB Testing
- Chest pain
- Shortness of breath
- Syncope
- Palpitations
Want the full clinical guide to Creatine Kinase-MB?
Reference ranges, causes, symptoms, preparation, and FAQs.