NPPB and hydrops fetalis: Both physical examination and chest x‐ray are prone to operator experience, subjective interpretation, and basic limitations, which renders them relatively unreliable.13, 14, 15, 16, 17, 18 BNP and NT‐proBNP (N‐terminal pro‐BNP) are useful to support the diagnoses or exclusion of HF in patients with dyspnea and have shown value in risk stratification.19, 20, 21 However, their performance as a quantitative parameter in relation to the extent of fluid overload is limited.