BNP / NT-proBNP Test
A blood test that helps diagnose and monitor heart failure.
Quick Summary
To check whether breathlessness may be due to heart failure.
BNP or NT-proBNP, hormones released when the heart is stretched.
No special preparation.
Overview
The heart releases more BNP when it's under strain.
A normal result makes heart failure unlikely.
What It Measures
BNP or NT-proBNP
Heart strain marker.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| BNP | Below 100 | pg/mL |
| NT-proBNP (age under 75) | Below 125 | pg/mL |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
High levels suggest heart failure, though age, kidney disease and lung conditions also raise them.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Natriuretic Peptide Tests (BNP, NT-proBNP)(opens in a new tab) · MedlinePlus, US National Library of Medicine