Heart Fatty Acid Binding Protein (H-FABP) is a novel small cytoplasmic protein abundant in the heart that is highly cardiac-specific (expressed primarily in cardiac tissue). When the cardiomyocytes are damaged, they can be quickly released into the blood. The plasma concentration starts to increase at 30 minutes after AMI, peaks around 6-8h, and returns to normal at 12-24h. Foreign studies have shown that H-FABP has a higher sensitivity and specificity in diagnosis of early AMI, combined with creatine kinase isoenzyme and troponin I are three new indicators of myocardial infarction.