Can this result diagnose a condition on its own?

No. Laboratory results are interpreted with symptoms, medical history, specimen conditions and related tests.

Which reference range should I use?

Start with the performing laboratory's own reference interval; clinical cutoffs, when relevant, are separate sourced thresholds used for a specific purpose.

When should I discuss the result with a healthcare professional?

Results that are clearly outside range, persistent, symptomatic or unexpected should be reviewed by a healthcare professional.

Information about a laboratory test

CK-MB: What Does This Test Measure?

The CK-MB test measures the CK-MB isoenzyme of creatine kinase, which is relatively enriched in heart muscle but is not completely heart-specific.

Test summary

Test name: CK-MB
Abbreviations: CK-MB
Category: Cardiac / Muscle Biomarkers
Panel: Cardiac Injury Assessment
Specimen: Serum / plasma
Common units: ng/mL, U/L (method-dependent)

What does the test measure?

The CK-MB test measures the CK-MB isoenzyme of creatine kinase, which is relatively enriched in heart muscle but is not completely heart-specific.

Why is the test ordered?

It is used when heart muscle injury is suspected, especially in acute chest-pain evaluation, together with symptoms, ECG findings and often serial measurements.

Information about a low result

A low value is usually not interpreted as a clinical problem by itself; the purpose of testing and laboratory context matter.

Information about a high result

High CK-MB can occur with cardiac or skeletal-muscle injury. For myocardial injury, troponin is generally more specific and preferred in current practice.

Reference and clinical context

Start with the performing laboratory's reference interval, unit, specimen type and method. Numeric information on this page is stored as sourced example intervals or clinical thresholds.

Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.

Interpretation notes

CK-MB is not completely heart-specific and can be influenced by skeletal muscle. Current assessment of acute myocardial injury relies mainly on high-sensitivity troponin.

Related specialties

Cardiology
Emergency Medicine
Internal Medicine

Frequently asked questions

More information about this test

CK-MB: High Result: What Does It Mean?

Sources

Troponin Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2023 · Troponin testing and cardiac muscle injury interpretation · Verified: Aug 12, 2026
Creatine Kinase — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2023 · CK testing, muscle injury and CK isoenzyme context · Verified: Aug 12, 2026