Brain natriuretic peptide (B-type, measured in serum/plasma)

What Is BNP Used For?

BNP is primarily used to evaluate symptoms like shortness of breath, fatigue, or swelling that may indicate heart problems. It can also help determine if fluid retention (edema) or heart failure is causing these issues, especially in people with chest pain, rapid heartbeat, or other concerning symptoms.

How Is BNP Tested?

A small blood sample is taken from a vein in your arm. The test measures the amount of BNP in your serum or plasma, which is then analyzed in a lab to provide results.

What Does a High or Low BNP Level Mean?

Elevated BNP levels often suggest conditions like heart failure, where your heart isn’t pumping blood efficiently, or fluid overload. Lower than normal levels may indicate less strain on your heart or no fluid buildup. However, other factors (like age, kidney disease, or certain medications) can affect BNP levels, so results should be interpreted by your healthcare provider.

What Might Affect Your BNP Results?

Several factors can influence BNP levels, including age, kidney function, high blood pressure, heart rhythm issues, or certain medications (like diuretics or blood pressure drugs). If you have any of these conditions or take medications, let your doctor know before the test.