BNP is remarkably stable at room temperature for up to 72 hours without aprotinin, making it the most practical natriuretic peptide for routine clinical heart failure testing.
72 hours stableBNP remained reliable at room temperature for up to 3 days without enzyme inhibitors, far surpassing ANP stability
What the researchers found
BNP remained stable at room temperature for up to 72 hours without aprotinin, while ANP degraded significantly within hours. This stability makes BNP the most practical natriuretic peptide for routine clinical testing.
Why it matters
A blood test is only useful if samples don't degrade during routine handling. BNP's exceptional stability at room temperature is a key reason it became the standard clinical heart failure biomarker over ANP.
How the study worked
In-vitro stability study comparing BNP, ANP, and NT-ANP degradation rates in blood samples at room temperature over 72 hours, with and without the protease inhibitor aprotinin.
What this study cannot tell us
In-vitro stability study. Actual clinical sample handling conditions may vary. Results specific to the assay methods used.
How to read the evidence
Moderate evidence from a well-designed stability study with clinical practice relevance, comparing multiple peptides under standardized conditions.
When this study was published
Published in 1999. BNP's practical stability advantages have been confirmed and are reflected in current clinical laboratory guidelines.
The bigger picture
The best biomarker isn't just the most sensitive — it must also survive the practical realities of clinical labs. BNP's room temperature stability was a decisive factor in its adoption as the worldwide standard for heart failure testing.
Questions still open
- Does BNP stability vary between different patient populations?
- Could improved sample handling extend ANP's stability enough for clinical use?
- Does BNP degradation rate differ in different blood collection tubes?
Common questions
Why does sample stability matter for a blood test?
Is this why doctors use BNP instead of ANP?
Read the original research
Cardiac peptide stability, aprotinin and room temperature: importance for assessing cardiac function in clinical practice.
Clinical science (London, England : 1979), 97(6), 689-95
Citation
Buckley, M G; Marcus, N J; Yacoub, M H. (1999). Cardiac peptide stability, aprotinin and room temperature: importance for assessing cardiac function in clinical practice.. Clinical science (London, England : 1979), 97(6), 689-95.