NPPB and hydrops fetalis: For NT‐proBNP testing, PPV improved across age groups from 13.0% (12.2–13.7), to 23.1% (22.6–23.5) and 32.8% (31.7–33.9) in <50 years, 50–74 years and ≥75 years groups, respectively, due to the increasing prevalence of HF with age.