NT normal value

Not all diseases cause elevated N-terminal pro-B-type natriuretic peptide (NT-proBNP); in addition to heart failure, renal failure and severe respiratory disorders can also lead to increased levels of this biomarker. So what constitutes a normal value?

Normal NT-proBNP Values

The normal reference range for N-terminal pro-B-type natriuretic peptide (NT-proBNP) is <125 ng/L. In patients with acute heart failure, NT-proBNP levels typically approach 300 ng/L; thus, an NT-proBNP level <300 ng/L effectively rules out acute heart failure, while an NT-proBNP level <125 ng/L excludes chronic heart failure.

In patients with acute heart failure, NT-proBNP levels should be interpreted with consideration of age and renal function. Age- and renal-function–adjusted diagnostic thresholds include: >450 ng/L for patients over age 50, >900 ng/L for those over age 75, and >1800 ng/L for patients with renal insufficiency. NT-proBNP may also be elevated in conditions such as acute heart failure, acute coronary syndrome, atrial fibrillation, diabetic vasculopathy, diabetic nephropathy, and renal dysfunction. BNP is a peptide hormone synthesized by the heart; during its biosynthetic processing, part of the prohormone is cleaved to yield NT-proBNP.

Notably, NT-proBNP elevation is particularly common in cases of severe sodium and water retention, necessitating prompt, targeted clinical management. We hope this information proves helpful to you!