Fig. 3From: The minimal informative monitoring interval of N-terminal pro-B-type natriuretic peptide in patients with stable heart failureCurves of signal and noise in the overall stable heart failure population. Signal exceeded noise after 7.9 months from baseline. Noise corresponded to a 61% increase in serum N-terminal pro-B-type natriuretic peptide (NT-proBNP) from baselineBack to article page