Normal Range of CK-MB
May 25, 2022
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Creatine kinase isoenzyme (CK-MB) is an enzyme present in cardiac myocytes and aids in the diagnosis of myocardial injury. The normal reference range is typically 0–25 U/L for males and 0–20 U/L for females. Slight variations in the normal range may occur depending on the testing laboratory and methodology used. When cardiac myocytes are damaged, the integrity of the cell membrane is compromised.
CK-MB generally refers to creatine kinase isoenzyme (CK-MB), with a normal reference range typically of 0–25 U/L for males and 0–20 U/L for females.
CK-MB is an enzyme present in cardiac myocytes and serves as a biomarker for diagnosing myocardial injury. Its normal reference range is generally 0–25 U/L for males and 0–20 U/L for females; however, slight variations may occur depending on the testing laboratory and methodology employed. When cardiac myocytes are damaged—such as in acute myocardial infarction or myocarditis—the integrity of the cell membrane is compromised, leading to leakage of CK-MB into the bloodstream and consequently elevated serum concentrations.
For instance, following an acute myocardial infarction, CK-MB levels begin to rise within 3–8 hours, peak at 18–24 hours, and then gradually decline. Thus, measuring serum CK-MB levels assists clinicians in detecting myocardial injury and assessing its severity. However, elevated CK-MB is not exclusively indicative of myocardial infarction; other conditions—including intense physical exertion and skeletal muscle injury—may also cause increases. Therefore, clinicians integrate CK-MB results with the patient’s clinical symptoms, electrocardiogram (ECG) findings, and other diagnostic tests for comprehensive evaluation.
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