Importance of OGTT for diagnosing diabetes mellitus based on prevalence and incidence of retinopathy

Diabetes Res Clin Pract. 2000 Aug;49(2-3):181-6. doi: 10.1016/s0168-8227(00)00156-x.


Study was made on the necessity and importance of the oral glucose tolerance test (OGTT) for diagnosing diabetes mellitus based on prevalence and incidence of diabetic retinopathy. Subjects were 12208 persons undergoing OGTT between 1965 and 1997. The prevalence of retinopathy was significantly elevated with FPG>/=126 and 2-h PG>/=198 mg/dl. The incidence of retinopathy was 15-30/10000 person-years (PY) with FPG<125, but with FPG of 126-139 it was significantly higher (69/10000 PY) and at 140-199 mg/dl it was elevated to 139/10000 PY. Subjects were classified at initial test into FPG<110, 110-125, 126-139, and >/=140 and further into 2-h PG<200 and >/=200 mg/dl for comparison with the incidence of retinopathy. Even with the same FPG, the incidence was two- to threefold higher with 2-h PG>/=200 mg/dl, indicating that 2-h PG was highly associated with the incidence of retinopathy. As for IFG, the prevalence of diabetes as defined by 2-h PG>/=200 in the OGTT increased with elevated FPG, and 33.7% of IFG cases showed 2-h PG>/=200 mg/dl. Based on the prevalence and incidence of retinopathy, we conclude that 126 mg/dl FPG is an appropriate cut-off level, and the OGTT is important for diagnosing mild diabetes mellitus.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Blood Glucose / analysis*
  • Blood Glucose / metabolism
  • Diabetes Mellitus / diagnosis*
  • Diabetes Mellitus / epidemiology*
  • Diabetic Retinopathy / epidemiology*
  • Fasting
  • Female
  • Glucose Intolerance / diagnosis
  • Glucose Intolerance / epidemiology
  • Glucose Tolerance Test*
  • Glycated Hemoglobin A / analysis
  • Humans
  • Incidence
  • Japan / epidemiology
  • Male
  • Middle Aged
  • Predictive Value of Tests
  • Prevalence
  • Reproducibility of Results


  • Blood Glucose
  • Glycated Hemoglobin A