The levels of serum myoglobin in cardiac patients with elevated creatine kinase-MB and suspected acute myocardial infarction.

A monoclonal antibody enzyme immunoinhibition assay was used to quantitate serial serum myoglobin (Mb) levels in 121 patients who had > or = 5% creatine kinase-MB (CK-MB) and suspected acute myocardial infarction (AMI). Serum Mb levels higher than 0.16 micrograms/ml were considered abnormal.