Amino-terminal natriuretic peptide precursor, which can also be abbreviated as NT-proBNP, is generally used in the clinic to diagnose heart failure and to determine the severity of heart failure, and its standardized value is set in relation to age, with the value of <450 ng/L for patients under 50 years old; <900 ng/L for patients over 50 years old; and <1800 ng/L for patients over 75 years old. NT-proBNP is currently the most widely used biomarker in the diagnosis and treatment of heart failure, and is helpful in the diagnosis and differential diagnosis of acute or chronic heart failure, risk classification, monitoring of the efficacy of heart failure treatment, and prognostic assessment. NT-proBNP is mainly excreted through the kidneys, and the excretion rate decreases with age, so the clinical standard value is usually set in relation to age, with <450 ng/L for patients under 50 years old, <900 ng/L for patients over 50 years old, and <1800 ng/L for patients over 75 years old. When abnormal elevation of NT-proBNP occurs, it is recommended to go to the hospital for a comprehensive analysis under the guidance of a doctor to further clarify the diagnosis.