Heart Failure and the BNP Blood Test
When heart failure develops or worsens, the ventricles or lower chambers of the heart produce a substance that breaks down to form two proteins: B-type natriuretic peptide (BNP) and N-terminal-pro-BNP (NT-pro-BNP). Both substances are secreted in response to changes in pressure that occur with heart failure. BNP and NT-pro-BNP levels in the blood increase when heart failure symptoms worsen, and decrease when the heart failure condition is stable.
BNP and NT-pro-BNP levels in a person with heart failure -- even someone whose condition is stable -- are higher than in a person with normal heart function.
Understanding Heart Failure -- the Basics
Heart failure is a condition in which the heart can't pump blood effectively to the lungs or the rest of the body. This can be because the person has developed a weakened heart muscle or because the heart muscle has thickened, making it difficult to fill the heart and backing up blood into the lungs. With heart failure, the weakened heart pumps less blood than usual, causing the kidneys and adrenal glands to produce chemicals that help the body to hold onto salt and water. In addition, the...
Read the Understanding Heart Failure -- the Basics article > >
Why Is a BNP Blood Test Needed?
BNP levels help to determine if you have heart failure, rather than another condition that may cause similar symptoms. In addition, BNP testing helps your doctor determine if your heart failure has worsened, evaluate what other treatments are needed, if you need to be hospitalized, and determine your prognosis (how well you will do in the future). Depending on what tests are available at your medical center, the BNP and/or NT-pro-BNP test may be performed. Both tests have been shown to be beneficial.
What Happens During a BNP Blood Test?
During a BNP blood test, a small amount of blood is taken and placed in a machine that detects the level of BNP and NT-pro-BNP in your blood. The test takes about 15 minutes.
What Do the Results of the BNP Blood Test Mean?
The level of BNP tends to increase with the level of disease severity.
In recent studies, patients who had an elevated level of either BNP or NT-pro-BNP had a higher risk of death and illness from heart failure.
Ask your health care provider to explain the results of your BNP tests.
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