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The WHO uses the 75 gr.oral
glucose load, and the diagnosis is based on the fasting and 2-hr blood glucose
levels. In contrast, the NDDG and the Coustan modification, uses a 100 gr.
glucose load and the diagnosis is based on four measurements (fasting, 1, 2 and
3 hr. glucose levels). It is also important to note, that the diagnostic blood
glucose levels are lower by the NDDG than by the WHO method, and even lower by
Coustan�s method. Differences in the diagnostic methods and criteria used in
different geographic areas could account, at least in part, for reported
differences in the prevalence of GDM.
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