Interprets NT-proBNP levels for heart failure diagnosis and rule-out. Age-stratified cutoffs: <75 years: 125 pg/mL (rule-out), 450 pg/mL (rule-in); ≥75 years: 450 pg/mL (rule-out), 1800 pg/mL (rule-in). BNP cutoffs: <100 pg/mL rule-out, >400 pg/mL rule-in. Includes effect of obesity and renal failure.
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