NPPB and hydrops fetalis: Abnormal NT-proBNP was closely associated with severity of HF (median [IQR] = 831.4 [138.8 to 2803.3] pg/mL in non-HF, with 1110.0 [330.1 to 3507.5] pg/mL in HFpEF, and with 6190.0 [1490.0 to 15,616.0] pg/mL in HFrEF; p < 0.001), but was not associated with TUG, HGS and 6 MW.