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B-type Natriuretic Peptide (BNP) in Clinic

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

BNP is a hormone produced by the heart in response to changes in blood pressure and volume. It is primarily used to diagnose and assess the severity of heart failure.

Quick summary

BNP levels help diagnose and monitor 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 Clinic
interpretation: {"text":"0–450 pg/mL: BNP levels in this range are generally considered normal and indicate a lower likelihood of heart failure.","label":"Normal"}; {"text":">450 pg/mL: Higher levels suggest the presence of heart failure or other cardiac conditions, and further evaluation is warranted.","label":"Elevated"}

B-type Natriuretic Peptide (BNP) is a biomarker that is released by the heart ventricles in response to excessive stretching of heart muscle cells. It is a key indicator in the diagnosis and management of heart failure.

Elevated BNP levels in the blood suggest that the heart is under significant stress, which can be due to conditions such as congestive heart failure, myocardial infarction, or other cardiovascular diseases.

The measurement of BNP is particularly useful in the emergency department for rapid assessment of patients with acute dyspnea, helping to differentiate between cardiac and non-cardiac causes.

Frequently asked questions

What does a high BNP level mean?
A high BNP level typically indicates that the heart is under stress, which could be due to heart failure, hypertension, or other cardiac issues.
Can BNP levels change over time?
Yes, BNP levels can fluctuate based on the patient's condition, treatment, and overall cardiovascular health.
  1. 1
    BNP and NT-proBNP as Markers of Heart FailureSource
  2. 2
    Clinical Use of BNP and NT-proBNP in Heart FailureSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

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