Study of 583 cases of the 50g glucose challenge test to screen the gestational diabetes mellitus.

Objective:To study the clinical significance of GCT value.Methods:The pregnant women who attended prenatal care were screened for GDM.Material such as maternal age,gravidity,parity,body weight before and during pregnancy,gestational age,etc were recorded in detail.The relationship were analyzed between above-mentioned factors and GCT value.Results:(1)24.01% of all the pregnant women show abnormal blood value in GCT,of which 54.29% has different degree of gestational intolerance.15 cases(2.57%)was diagnosed GDM,61 cases(10.46%)were GIGT.If the value of 8.3 mmol/L was used as the cut-point of 50g GCT to screen the GDM,25.71% of the pregnant women would avoid being tested by OGTT and 93.42% of all the glucose-intolerance women could still be recognized.(2) 64 pregnant women had a false-positive GCT result,23 of whom received repeated screening during 32-34 gestational week and 1 GDM(4.35%)and 4 GIGT(17.39%)were recognized.(3) Tile GCT value was positively correlated with body weight,BMI and weight gain during pregnancy.The GCT value was also positively correlated with the incidence,of GIGT and GDM.(4)The rate of preterm labor and polyhydramnios was 8.57% and 7.86%respectively in GCT abnormal group,which were markedly higher than that of GCT normal group(P0.001).