BNP is a substance secreted from the ventricles or lower chambers of the heart in response to changes in pressure that occur when heart failure develops and worsens. The level of BNP in the blood increases when heart failure symptoms worsen, and decreases when the heart failure condition is stable. The BNP level in a person with heart failure – even someone whose condition is stable – is higher than in a person with normal heart function.

Preparation

To test the BNP level, a small amount of blood is taken and placed in a machine that detects the level of BNP in your blood. The test takes about 15 minutes. The BNP level helps to determine if you have heart failure, rather than another condition that may cause similar symptoms. In addition, BNP help the physician make decisions about hospitalizations, aggressive treatments, and future prognosis.

Results

• BNP levels below 100 pg/mL indicate no heart failure.
• BNP levels of 100-300 pg/mL suggest heart failure is present.
• BNP levels above 300 pg/mL indicate mild heart failure.
• BNP levels above 600 pg/mL indicate moderate heart failure.
• BNP levels above 900 pg/mL indicate severe heart failure.