Sample cut-off values for B type natriuretic peptide (BNP) and the N-terminal portion of the prohormone (NTproBNP) in the diagnosis or exclusion of heart failure
| Value below which chronic heart failure is unlikely (rule out value) (ng/l) | Indeterminate zone (ng/l) | Value above which acute heart failure is very likely (rule in value) (ng/l) | ||||
| BNP | NTproBNP | BNP | NTproBNP | BNP | NTproBNP | |
| <50 y | 40 | 50 | >40–<100 | >50–<450 | 100 | 450 |
| 50–75 y | 40 | 75 | >40–<100 | >100–<900 | 100 | 900 |
| >75 y | 40 | 250 | >40–<100 | >250–<1800 | 100 | 1800 |
Data adapted from the literature.46–49