B-type natriuretic peptide is also called BNP, if this index is more than 400ng/L, the patient may have heart failure, and the positive predictive value is 90%, but the value of B-type natriuretic peptide can’t be used to determine whether the patient has heart failure or not. However, it is not possible to determine whether a patient is in heart failure by this index alone, because B-type natriuretic peptide is affected by many factors. If you want to clarify whether a patient is in heart failure, it is recommended that the patient’s clinical symptoms and the left ventricular ejection fraction on cardiac ultrasound should be taken into account for further evaluation.