Importantly, these two cutoff sets are modifi cations of those developed 52 years ago that were selected to identify women
who were more likely to have diabetes after pregnancy. Further, the requirement that two or more abnormal results are required to defi ne an abnormal result was arbitrarily selected to avoid misclassifi cations due to “laboratory errors.” It should also be noted that in much of the rest of the world, a one-step approach is used to diagnose GDM using a two-hour, 75-gram OGTT. GDM is diagnosed when any single glucose result exceeds a diagnostic cutoff recommended by the World Health Organization (WHO).