Interpret NT-proBNP for heart failure diagnosis using age-stratified thresholds. Age below 50: rule-out below 300 pg/mL, rule-in at or above 450 pg/mL. Age 50-75: rule-out below 300 pg/mL, rule-in at or above 900 pg/mL. Age above 75: rule-out below 300 pg/mL, rule-in at or above 1800 pg/mL. Values above rule-in thresholds support acute HF with high specificity.
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