CK-MB (Activity)
CK-MB (activity) measures the enzymatic activity of CK-MB in blood. It is used to help diagnose heart attacks and monitor heart damage. This is the enzyme activity assay (U/L).
Category: Cardiac Markers
Also known as: ck-mb activity, ck mb activity, creatine kinase mb activity, cpk-mb activity
Reference range: 0–25 U/L (Source: ABIM)
Standard unit: U/L
High values may indicate
High CK-MB activity may indicate heart attack (myocardial infarction), myocarditis, cardiac surgery trauma, or cardiac contusion.
Low values may indicate
Low or undetectable CK-MB activity is normal and suggests no significant heart muscle damage.
Frequently asked questions
- What is a normal CK-MB (Activity) level?
- A typical reference range for CK-MB (Activity) is 0–25 U/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is CK-MB (Activity) measured in?
- CK-MB (Activity) is most commonly reported in U/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do CK-MB (Activity) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track CK-MB (Activity) over time?
- Yes. Upload results from any lab and BloodId charts your CK-MB (Activity) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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