What it measures
BNP (B-type natriuretic peptide) is a hormone released by the heart muscle when it is stretched, for example when the heart is working harder to pump. The test measures how much is in the blood. Many NHS labs measure a related fragment, NT-proBNP, instead.
Why people test it
- Measured when heart failure is suspected, for example with breathlessness or swollen ankles.
- Used to help decide how soon a heart scan (echocardiogram) is needed.
- Monitored over time in some people with heart failure.
Typical range
Ranges and cut-offs vary by lab and method, and levels rise with age and are affected by kidney function and some medicines. BNP and NT-proBNP results are on different scales and cannot be compared directly. Your report shows the lab's own cut-off.
Finger-prick or vein?
A finger-prick sample is accepted by some labs, as the test needs only a small amount of blood. A vein sample is taken where a lab or a larger panel needs more.