Cardiac blood tests include routine blood tests, biochemical tests, microbiological and immunological tests. 1. Routine blood tests: can assist in determining the presence of infective endocarditis, anemia or thrombocytopenia. 2. Biochemical tests: Lipid tests, which can evaluate the patient’s blood lipid level. Myocardial injury markers (troponin, myoglobin, cardiac enzymes), troponin has a certain value for the severity of myocardial ischemic injury. Myoglobin has some diagnostic value for early myocardial infarction and myocardial reinfarction. 3. Microbiological and immunological examination: cardiac microbial culture, antibody detection, etc. can help to diagnose infective endocarditis. 4. BNP and NT-proBNP: These two hematological indicators can be used to diagnose heart failure, rule out heart failure, and determine the severity of heart failure. It is recommended to go to the hospital for timely treatment if you have any discomfort symptoms in your heart.