NT-proBNP — N-terminal pro-B-type Natriuretic Peptide¶
1. What is NT-proBNP?¶
NT-proBNP is the N-terminal fragment of the prohormone B-type natriuretic peptide, released by cardiac myocytes in response to myocardial stretch and wall stress. It is the gold-standard cardiac biomarker for detecting and staging heart disease (mitral valve disease, cardiomyopathy) in dogs and cats.
2. Data Card¶
| Field | Value |
|---|---|
| Biomarker | NT-proBNP |
| Full name | N-terminal pro-B-type natriuretic peptide |
| Organ | Heart (cardiac function) |
| Species | Canine, Feline |
| Specimen | Serum / Plasma / EDTA plasma |
| Method | FICT (Fluorescence Immunochromatography) |
| Analyzer | FIA680 / FIA880 |
| Unit | pmol/L |
3. Reference Range (Canine)¶
| NT-proBNP (pmol/L) | Interpretation |
|---|---|
| < 900 | Normal — heart disease unlikely |
| 900–1800 | Grey zone — correlate with echo/clinical signs |
| > 1800 | Consistent with significant heart disease |
4. Clinical Significance¶
- Early detection: rises before radiographic signs of cardiomegaly.
- Disease staging: helps distinguish cardiac vs non-cardiac causes of dyspnea/cough.
- Breed screening: valuable for pre-breeding screening of DCM/MVD-prone breeds (Doberman, Cavalier King Charles).
- Therapy monitoring: trends down with effective heart-failure therapy.
5. Analytical Performance (Migibio Assay)¶
| Metric | Value |
|---|---|
| LOD | 15 pmol/L |
| LOQ | 30 pmol/L |
| Linear range | 30–10,000 pmol/L |
| Intra-assay CV% | < 8% |
| Inter-assay CV% | < 10% |
6. Interpretation Guide¶
| NT-proBNP (pmol/L) | Action |
|---|---|
| < 900 | Reassure; monitor if clinical signs persist |
| 900–1800 | Recheck + echocardiography |
| > 1800 | Cardiac workup + therapy planning |
| > 3000 | Advanced disease — specialist referral |
7. FAQ¶
Q1. What does an elevated NT-proBNP mean?
An elevated NT-proBNP indicates myocardial stretch or wall stress, most commonly from heart disease. In a dyspneic patient it shifts the differential toward a cardiac cause; in a screening context it can detect occult heart disease before clinical signs appear.
Q2. Why do dogs and cats have different NT-proBNP cutoffs?
Cardiac size, physiology, and normal circulating peptide levels differ between species. The canine reference is below 900 pmol/L, while the feline reference is below 100 pmol/L — the two are not interchangeable.
Q3. Can NT-proBNP diagnose a specific heart disease?
No. NT-proBNP indicates cardiac involvement or stretch, not the specific disease. Echocardiography is required to identify the underlying disease (e.g., mitral valve disease, cardiomyopathy).
Q4. Does kidney disease affect NT-proBNP?
Yes. Reduced glomerular filtration can elevate NT-proBNP, so the result should be interpreted in the context of renal function.
8. References¶
- Janson CO, Hezzell MJ, Oyama MA, et al. Focused cardiac ultrasound and point-of-care NT-proBNP assay in the emergency room for differentiation of cardiac and noncardiac causes of respiratory distress in cats. J Vet Emerg Crit Care. 2020;30(6):679-686. PMID: 32579274
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Authored by: Migibio Clinical & Scientific Affairs, Guangzhou Magic Biotech Co., Ltd.
Reviewed by: Migibio R&D Quality Committee
Last updated: 2026-08-13
Disclosure: Migibio (Guangzhou Magic Biotech Co., Ltd.) is the manufacturer of the FIA680/FIA880 analyzers and FICT reagents referenced in this content. See our Editorial & Review Policy.