Table 2.

Distribution of glycated haemoglobin values during 24–28 weeks of pregnancy and presence of gestational diabetes mellitus by O'Sullivan's criteria.

HbA1c (%)	Normal HPLC profile
Range (mean ± SD)	2.4–5.9 (4.46 ± 0.61)
	GDM – ve	GDM + ve
≤ 3.5	18	1
> 3.5–4.5	99	2
> 4.5–6.0	114	2
Total	231	5

GDM: gestational diabetes mellitus, HPLC: high-performance liquid chromatography, HbA_1c: haemoglobulin A_1c, SD: standard deviation.