Diagnostic strategies for GDM (generally at 24–28 weeks of gestation)
| . | ACOG/CC . | IADPSG . |
|---|---|---|
| Process | Two steps: nonfasting 50-g GCT followed by 100-g OGTT | One step: universal 75-g OGTT |
| GDM diagnostic thresholds (mg/dL) | ||
| Fasting | ≥95 | ≥92 |
| 1 h | ≥180 | ≥180 |
| 2 h | ≥155 | ≥155 |
| 3 h | ≥140 | N/A |
| . | ACOG/CC . | IADPSG . |
|---|---|---|
| Process | Two steps: nonfasting 50-g GCT followed by 100-g OGTT | One step: universal 75-g OGTT |
| GDM diagnostic thresholds (mg/dL) | ||
| Fasting | ≥95 | ≥92 |
| 1 h | ≥180 | ≥180 |
| 2 h | ≥155 | ≥155 |
| 3 h | ≥140 | N/A |
ACOG (29)/CC (28) process and criteria for GDM compared with the IADPSG process and criteria (23). In the ACOG/CC process, an initial GCT with 50 g glucose and 1-h postload glucose measurement is used, with variable thresholds (130–140 mg/dL) for progression to formal fasting 100-g OGTT. The ACOG/CC process requires two values greater than the threshold for GDM diagnosis, whereas one value greater than the threshold is sufficient for diagnosis by IADPSG criteria. ACOG also accepts GDM diagnosis by the National Diabetes Data Group (NDDG) criteria, which use higher threshold values (48) (data not shown). N/A, not applicable.