ALB and hydrops fetalis: There is a significant positive correlation between HF and TB (r = 0.53, P < 0.001), a significant positive correlation between TP and ALB (r = 0.53, P < 0.001), a significant negative correlation between HF and PTA (r=-0.55, P < 0.001), and a significant negative correlation between TB and PTA (r=-0.47, P < 0.001).