GCG and hydrops fetalis: Correlation analysis of diurnal differences for MTT-HF revealed that, in NGT subjects, diurnal variation of glucose levels (Δ iAUC0-180) correlated with response variation of insulin (r = 0.738, p < 0.001) and glucagon (r = −0.556, p = 0.020); and insulin and glucagon variations were associated with each other (r = −0.568, p = 0.17).