Patient is having normal CK & CKMB after 2 days of chest pain which of the following is true-
Correct Answer: Excludes diagnosis of MI
Description: A significant concentration of CK-MB isoenzyme is found almost exclusively in the myocardium, and the appearance of elevated CK-MB levels in serum is highly specific and sensitive for myocardial cell wall injury. Normal reference values for serum CK-MB range from 3 to 5% (percentage of total CK) or 5 to 25 IU/L.if theses are normal then the MI diagnosis can be excluded Ref Davidson edition23rd pg 440
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