B-type brain natriuretic peptide precursor is mostly used to indicate the presence of heart failure, and 64pg/mL is within the normal range. B-type brain natriuretic peptide precursor is mainly synthesized and secreted by ventricular myocytes, and will form brain natriuretic peptide after processing by the body. Brain natriuretic peptide is involved in the regulation of blood pressure, blood volume, and water-salt balance in the body. The normal reference value of brain natriuretic peptide is less than 125 pg/mL, at present, the main clinical indicator of brain natriuretic peptide is B-type natriuretic peptide precursor which is obviously elevated to indicate that the patient may have heart failure, and 64 pg/mL belongs to the normal range, so there is no need to worry too much. If the index is normal, but there is chest tightness, dyspnea and other discomforts, please consult a doctor in time to improve the electrocardiogram, cardiac ultrasound and other related examinations to clarify the diagnosis and standardized diagnosis and treatment.