Normal value of CK-MB
Dec 29, 2022
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
CK-MB usually refers to creatine kinase-MB, an enzyme present in myocardial cells, with a normal value typically ranging from 0 to 25 U/L. Elevated levels are primarily seen in acute myocardial infarction, although mild increases may also occur in patients with cerebrovascular diseases, hypothyroidism, or muscle injury, but the degree of elevation is generally not significant.
CK-MB usually refers to creatine kinase MB isoenzyme, an enzyme present in cardiac muscle cells, with a normal value generally ranging from 0–25 U/L.
The creatine kinase MB isoenzyme has relative specificity for the heart muscle. Although small amounts are also found in other tissues such as skeletal muscle, its levels rise more significantly in the blood during myocardial injury, making it one of the important biomarkers for diagnosing myocardial damage. The normal reference range for this marker is typically 0–25 U/L. Elevated levels are primarily observed in acute myocardial infarction, but mild increases may also occur in patients with cerebrovascular diseases, hypothyroidism, or muscle injuries.
This marker has relatively high specificity for acute myocardial infarction. It is predominantly located in the heart muscle and is released into the bloodstream when myocardial necrosis occurs. During acute myocardial infarction, its level usually rises significantly, often exceeding four times the upper limit of normal. When cardiac muscle cells are damaged due to conditions such as myocardial infarction or myocarditis, the integrity of the cell membrane is disrupted, leading to leakage of creatine kinase MB isoenzyme into the blood and consequently increasing its concentration. Measuring the level of this marker in the blood helps assess whether myocardial injury has occurred and evaluate its severity.
In daily life, it's advisable to maintain a light diet and avoid spicy or irritating foods such as garlic, hot pot, wasabi, etc. Adequate rest should be ensured, and excessive physical exertion should be avoided to prevent adverse effects on health.
