Table 2.
Characteristics of included studies that used 50 g oral glucose challenge test (OGCT) or 100 g oral glucose tolerance test (OGTT) for diagnosis of gestational diabetes
| No of women | Test type | Test timing* | Diagnosis exclusion criteria (mmol/L) | Outcomes† | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F | 1 | 2 | LGA | Macrosomia | S dystocia | Neonatal hypoglyc | Pre-eclampsia/PIH | Preterm birth | C section | Ind labour | Ins delivery | ||||
| Carr,25 2011, US (Seattle) | 25 969 | 50 g OGCT | — | X | — | 100 g OGTT ≥2 values fasting ≥5.3, 1 hour ≥10.0, 2 hour ≥8.6, and 3 hour ≥7.8 | — | — | — | — | X | X | — | — | — |
| Chandna,26 2006, Pakistan (Karachi) | 633 | 50 g OGCT | — | X | — | NR | — | — | — | X | X | — | X | — | X |
| Cheng,27 2007, US (California) | 13 901 | 50 g OGCT | — | X | — | NR | X | X | X | X | — | — | — | X | — |
| Figueroa,28 2013, US (multicentre) | 1839 | 50 g OGCT | — | X | — | 100 g OGTT fasting <5.3 + ≥2 values: 1 hour ≥10.0, 2 hour ≥8.6, 3 hour ≥7.8 | X | X | — | X | — | — | — | — | — |
| Hillier,29 2008, US (Hawaii and Portland) | 41 450 | 50 g OGCT | — | X | — | 100 g OGTT Two criteria used: (i) ≥2 values: fasting ≥5.8 or 1 hour ≥10.5 or 2 hour ≥9.2 or 3 hour ≥8.0; (ii) ≥2 values: fasting ≥5.3 or 1 hour ≥10.0 or 2 hour ≥8.6 or 3 hour ≥7.8 | — | X | — | — | — | — | — | — | — |
| Ong,30 2008, UK (Cambridge) | 3826 | 50 g OGCT | — | X | — | 50 g OGCT 1-hr >7.8 and 75 g OGTT levels NR. Fasting >6.1 2 hour level NR | — | — | — | — | — | — | X | — | X |
| Scholl,31 2001, US (New Jersey) | 1157 | 50 g OGCT | — | X | — | NR | X | — | — | — | X | X | X | — | — |
| Sermer,32 1995, Canada (Toronto) | 3637 | 50 g OGCT / 100 g OGTT | X | X | X | 100 g OGTT ≥2 values: fasting >5.8 or 1 hour >10.5 or 2 hour >9.1 or 3 hour >8.0 | — | X | — | — | X | — | X | — | — |
| Witter,33 1988, US (Baltimore) | 3897 | 50 g OGCT | — | X | — | 100 g OGTT ≥2 values: fasting ≥5.8 or 1 hour ≥10.5 or 2 hour >9.1 or 3 hour >8.0 | — | X | — | — | — | — | — | — | — |
| Yee,34 2011, US (California) | 13 789 | 50 g OGCT | — | X | — | 100 g OGTT ≥2 values: fasting >5.8 or 1 hour ≥10.5 or 2 hour ≥9.1 or 3 hour ≥8.0 | X | X | X | — | X | — | X | — | — |
LGA=large for gestational age; NR=not reported.
*F=fasting, 1=one hour post-load, 2=two hours post-load.
†Large for gestational age, macrosomia, shoulder dystocia, neonatal hypoglycaemia, pre-eclampsia/PIH (pregnancy induced hypertension), preterm birth, caesarean section, induced labour, instrumental delivery.