B-type natriuretic peptide is a test used in cardiovascular medicine to identify heart failure, referred to as the BNP test, which is a simple test that is performed by drawing peripheral venous blood. B-type natriuretic peptide is also known as a biomarker of heart failure and is more accurate for the diagnosis of heart failure. Heart failure is a structural and functional change of the heart caused by the development of various cardiovascular diseases to a certain stage, thus manifesting as a decrease in systolic and diastolic capacity, which leads to many adverse consequences. Early detection of heart failure allows for early intervention and treatment to prevent serious complications. Among the biomarkers of heart failure, B-type natriuretic peptide or precursors of B-type natriuretic peptide can be selected for measurement. Combine these with cardiac ultrasound findings and the patient’s symptoms and signs, such as wheezing, dyspnea, decreased activity tolerance, and lower extremity edema, to identify or diagnose heart failure.