Natriuretic Peptide Tests (BNP, NT-proBNP) Test
This test measures the amount of natriuretic peptides (BNP or NT-proBNP) in your blood to help confirm or rule out heart failure.
What this test measures
Natriuretic peptides are proteins made by your heart and blood vessels. The test measures BNP or NT-proBNP levels in a blood sample. High levels may indicate heart failure.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Higher-than-normal results
Higher than normal levels may be a sign of heart failure. The higher the level, the more serious the heart failure may be. Other conditions like kidney failure, heart valve disease, or lung disorders can also cause high levels.
Lower-than-normal results
Normal levels usually mean heart failure is unlikely. However, obesity can make levels lower than they really are, so your provider may still do other tests if heart failure is suspected.
Frequently asked questions
What are natriuretic peptides?
They are proteins made by your heart and blood vessels. Your heart releases more of them when it has to work harder to pump blood.
Why is this test done?
It is mainly used to help diagnose or rule out heart failure in people who have symptoms like shortness of breath.
What do normal results mean?
Normal results usually mean you are unlikely to have heart failure. But if you have obesity, your levels may be falsely low, so your provider may order other tests.
What do high results mean?
High levels may mean you have heart failure. The higher the level, the more serious it may be. Other conditions like kidney failure or lung disorders can also raise levels.
Can this test alone diagnose heart failure?
No. A BNP or NT-proBNP test alone cannot diagnose the cause of your symptoms. Your provider will use it along with other tests and your medical history.
Related lab tests
Sources
- MedlinePlus: Natriuretic Peptide Tests (BNP, NT-proBNP) — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.