NT-proBNP
The optimal range for NT-proBNP (N-Terminal Pro B-Type Natriuretic Peptide) is commonly cited as <125 pg/mL, tighter than the standard lab reference range of <125 pg/mL (under age 75). Cardiac stress and volume-overload marker - useful ruling out heart failure and monitoring cardiac strain.
How NT-proBNP ranges relate
The standard lab range vs the optimization-focused target. Illustrative trajectory shows what a 12-week improvement pattern looks like — not real user data.
What NT-proBNP Measures
NT-proBNP is released by cardiac ventricular myocytes when they stretch - classically under volume overload or elevated filling pressures. It is the primary biomarker used to rule out heart failure in dyspneic patients in the ED, and has growing use in outpatient risk assessment.
Values rise with age, kidney disease, atrial fibrillation, and obesity-adjusted cut-offs apply. Very low values (<125 in under 75) have a strong negative predictive value for heart failure.
What Affects This Biomarker
NT-proBNP is influenced by: cardiac filling pressures, age (rises with age), kidney function (retention raises it), obesity (lowers it), AF, and physical conditioning. Rises acutely with exacerbations; trends over time matter more than single values.
In the Context of Peptide Protocols
Useful as a baseline for anyone on GH-axis peptides (which can cause water retention), GLP-1s (to establish cardiac baseline before weight-loss-induced changes), or with family history of cardiomyopathy. Trend over years matters more than isolated values.
Peptides That Commonly Move NT-proBNP
Frequently Asked Questions
What does NT-proBNP measure?
NT-proBNP is released by cardiac ventricular myocytes when they stretch - classically under volume overload or elevated filling pressures. It is the primary biomarker used to rule out heart failure in dyspneic patients in the ED, and has growing use in outpatient risk assessment.
What is the optimal range for NT-proBNP?
The optimal range for NT-proBNP is commonly cited as <125 pg/mL. The standard lab reference range is <125 pg/mL (under age 75).
What affects NT-proBNP levels?
NT-proBNP is influenced by: cardiac filling pressures, age (rises with age), kidney function (retention raises it), obesity (lowers it), AF, and physical conditioning. Rises acutely with exacerbations; trends over time matter more than single values.
Where This Fits in Your Panel
NT-proBNP is one marker on a fuller panel. The Peptide Blood Work Checklist lays out the complete baseline panel, what to add by protocol type, and when to retest.
See the full blood work checklist →Upload any lab PDF and MyProtocolStack maps your values to NT-proBNP and 40+ other biomarkers. StackAI interprets the trend in context of your protocol.
Start tracking →Last reviewed: June 2026
Informational only - not medical advice. Reference ranges vary by lab and individual context. Work with a licensed provider to interpret your specific results.