title: Clinical evaluation of a radiometric assay specific for creatine kinase isoenzyme MB.
abstract: A new radiometric assay specific for creatine kinase isoenzyme MB was evaluated with respect to its precision and agreement with a conventional electrophoretic CK-MB assay for the diagnosis of myocardial infarction. The reference interval we find for serum CK-MB in healthy subjects is 0--30 micrograms/L. The coefficients of variation at 197 and 40 micrograms of CK-MB per liter, were 5.2 and 11.5%, respectively. In a clinical study of 52 consecutive patients admitted into a Coronary Care Unit with a diagnosis of suspected myocardial infarction, there was overall agreement in CK-MB results by the two assays for 51 of 52 patients. A more sensitive and quantitative assay that is specific for CK-MB can be helpful in cases where diagnosis of myocardial infarction is equivocal.
mesh_terms: D000328:Adult; D000368:Aged; D004796:Clinical Enzyme Tests; D003402:Creatine Kinase / Q000097:blood*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007527:Isoenzymes; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D007527:Isoenzymes; D003402:Creatine Kinase