Cardiology • Biomarkers • Heart Failure Diagnostics

Natriuretic Peptide Tests (BNP, NT-proBNP)

Natriuretic Peptide Tests (BNP, NT-proBNP) are blood tests used to evaluate heart function and help diagnose or rule out heart failure. These biomarkers are released by the heart when it is under stress or working harder than normal.

BNP and NT-proBNP levels are key clinical biomarkers for assessing heart failure severity and cardiac stress.

What are BNP and NT-proBNP?

BNP (Brain Natriuretic Peptide) is a hormone released by the heart when it is under pressure. NT-proBNP is a related inactive fragment that is more stable in blood and widely used for laboratory testing. Both increase when the heart struggles to pump blood efficiently.

Clinical Uses

  • Diagnosis of heart failure
  • Assessment of disease severity
  • Monitoring treatment response
  • Evaluation after myocardial infarction

Common Symptoms for Testing

  • Shortness of breath
  • Swelling in legs, feet, or abdomen
  • Fatigue and weakness
  • Difficulty lying flat
  • Frequent nighttime urination

Interpretation of Results

Result Meaning
Normal BNP / NT-proBNP Heart failure is unlikely
Elevated levels Possible heart failure or cardiac stress
Very high levels Severe heart dysfunction requiring urgent evaluation

Conditions That Can Increase BNP / NT-proBNP

  • Heart failure
  • Kidney disease
  • Heart valve disorders
  • Pulmonary hypertension
  • Pulmonary embolism

Natriuretic Peptide Tests (BNP, NT-proBNP) are essential biomarkers in cardiology that provide fast and reliable insight into heart function. However, results should always be interpreted alongside clinical symptoms and additional diagnostic tests.