NT-proBNP Heart Failure Threshold by Age

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.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

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

Each component has a specific meaning:

  • Age-stratified thresholds — The age-stratified thresholds recorded for the scenario being assessed.

Note: Interpret the nt-probnp by age result against the thresholds and context described above.

How to Use

Enter the age-stratified thresholds for the scenario you are assessing. 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. Use the nt-probnp by age result to inform your calculation.

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Frequently Asked Questions