The Role of Untimed Blood Glucose in Screening for Gestational Diabetes Mellitus in a High Prevalent Diabetic Population

Table 2

Comparison between RBG values at booking and the carbohydrate metabolic status along with the sensitivity, specificity, positive predictor, and negative predictor values at each RBG range.

RBG value	NGT	GDM	Sensitivity	Specificity	Positive predictor	Negative predictor
Prevalence
Chi square
>4.5	149	92	69.2	43.3	38.2	26.5
60.9%
>5.0							70	64	48.1	73.4	47.8	26.3
33.8%
>5.6	34	52	39.1	87.1	60.5	26.1
21.7%
>6.0							26	35	26.3	90.1	57.4	29.3
15.4%
>6.6	8	25	18.8	97.0	75.8	29.8
8.3%
>7.0							6	16	14.4	97.7	72.7	31.7
5.6%