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N-terminal pro-brain natriuretic peptide (proBNP)

Published: August 9, 2026Updated: August 16, 2026

This test measures a protein fragment released when your heart is under stress, often due to heart failure or other cardiac conditions. It helps assess whether your heart is working as it should.

Quick summary

["ProBNP helps doctors evaluate heart function and guide treatment for conditions like heart failure."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
82176-9
Short code
RSV RNA Nph Ql NAA+n-prb
Synonyms
RSV RNA Nph Ql NAA+n-prb
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order a proBNP test if you have symptoms like shortness of breath, swelling in your legs or abdomen, or if you have a history of heart problems. It’s also used to monitor heart function in people with chronic conditions like high blood pressure or heart disease.

What Does a High or Low Level Mean?

High levels of proBNP often suggest heart strain, such as heart failure, while low levels may indicate normal heart function or other conditions affecting fluid balance. However, results depend on your overall health and symptoms.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab for analysis using an immunoassay method to measure the protein fragment.

What Should You Expect Before the Test?

No special preparation is needed, but inform your doctor about any medications, recent illnesses, or conditions that might affect results, such as dehydration or kidney problems.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: ProBNP in Heart Health

Short name

proBNP

Frequently asked questions

How accurate is the proBNP test for diagnosing heart failure?
The proBNP test is highly sensitive and specific for detecting heart strain, but it’s not definitive on its own. Doctors use it alongside other tests and symptoms to make a full assessment.
Can proBNP levels change with age or other health conditions?
Yes, proBNP levels can vary with age, kidney function, and other health issues like high blood pressure or lung diseases. Your doctor will consider these factors when interpreting results.
How often should I get a proBNP test?
Your doctor will determine how often you need testing based on your medical history, symptoms, and treatment plan. Follow-up tests may be scheduled periodically to monitor changes in your heart health.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy