Brain Natriuretic Peptide (BNP) Test
A brain natriuretic peptide (BNP) test measures the amount of the BNP hormone in your blood. BNP is made by your heart and shows how well your heart is working. Normally, only a low amount of BNP is found in your blood. But if your heart has to work harder than usual over a long period of time, such as from heart failure, the heart releases more BNP, increasing the blood level of BNP. The BNP level may drop when treatment for heart failure is working.
Why It Is Done
The brain natriuretic peptide (BNP) test is used to:
How To Prepare
You may be asked to not eat or drink anything except water for 8 to 12 hours before having a BNP test.
Your doctor may tell you to stop taking certain heart medicines before this test. Follow your doctor's instructions exactly.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).
How It Is Done
The health professional drawing your blood will:
How It Feels
You may feel nothing at all from the needle puncture, or you may feel a brief sting or pinch as the needle goes through the skin. Some people feel a stinging pain while the needle is in the vein. But many people do not feel any pain (or have only minor discomfort) once the needle is positioned in the vein. The amount of pain you feel depends on the skill of the health professional drawing the blood, the condition of your veins, and your sensitivity to pain.
There is very little risk of complications from having blood drawn from a vein.
A brain natriuretic peptide (BNP) test measures the amount of the BNP hormone in the blood. BNP values tend to increase with age and are higher in women than men.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
The amount of a related substance, called N-terminal pro brain-natriuretic peptide (NT-proBNP), may be measured instead of BNP. The results from the NT-proBNP test are different than those from the BNP test but provide similar information.
A high value of BNP in the blood:
What Affects the Test
Reasons you may not be able to have the test or why the results may not be helpful include:
What To Think About
eMedicineHealth Medical Reference from Healthwise
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