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B-type Natriuretic Peptide (BNP)

Published: July 27, 2026Updated: August 25, 2026

BNP is a hormone released by the heart in response to changes in pressure. It helps diagnose heart failure and assess its severity.

Quick summary

BNP is a diagnostic biomarker for heart failure.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
pg/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Abbott i-STAT BNP
interpretation: {"text":"0–100 pg/mL: BNP levels within this range are considered normal and suggest no significant heart failure.","label":"Normal"}; {"text":">100 pg/mL: Levels above 100 pg/mL may indicate heart failure or other cardiac conditions. Further evaluation is necessary.","label":"Elevated"}

B-type Natriuretic Peptide (BNP) is a hormone produced by the heart ventricles in response to increased pressure or volume. It plays a crucial role in regulating blood pressure, fluid balance, and cardiac function.

Measuring BNP levels in the blood is an essential diagnostic tool for heart failure. Elevated levels indicate the heart is under stress and not functioning properly, which can help in the early detection and management of the condition.

BNP levels are also used to monitor the effectiveness of heart failure treatments. A decrease in BNP levels may suggest that the treatment is working, while an increase may indicate the need for a change in the management plan.

Frequently asked questions

What is the normal range for BNP levels?
The normal range for BNP levels is typically between 0–100 pg/mL.
What does a high BNP level mean?
A high BNP level may indicate heart failure, but it can also be elevated in other conditions such as kidney disease or lung disease. Further testing is needed for a definitive diagnosis.
  1. 1
    BNP TestSource
  2. 2
    B-type Natriuretic Peptide (BNP)Source

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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy