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An NT-proBNP test, or N-terminal pro-B-type natriuretic peptide test, measures the level of the hormone NT-proBNP in the blood to help diagnose and monitor heart failure: Purpose What the test can do Diagnose heart failure Helps diagnose or rule out heart failure in people with symptoms Determine severity Determines the severity of heart failure Monitor treatment Monitors heart failure treatment Assess risk Assesses the risk of cardiovascular disease Predict LVEF Predicts a low left ventricular ejection fraction (LVEF) Identify risk factors Identifies patients with an increased risk of having a reduced LVEF