Long-term significance of gestational carbohydrate intolerance: a longitudinal study.

Severe forms of GDM have been conclusively associated with significantly increased risk of developing DM later on in life. The long-term significance of GIGT has not yet been definitely elucidated. The study was set up to compare the present carbohydrate metabolism status and anthropomorphic characteristics of women diagnosed as suffering from abnormal carbohydrate tolerance during pregnancy eight years previously with those recorded as having normal glucose tolerance. The prevalence of present abnormal glucose tolerance was significantly higher in women who had been noted to have carbohydrate intolerance during their pregnancy, the prevalence depending on the gestational severity (10.0% in normal glucose tolerance, 36.4% in borderline GIGT; 66.7% in GIGT). Women whose overweight or obese status persists or develops after their pregnancy were statistically more likely to develop abnormal glucose tolerance later on in life (11.9-12.5% in normal-overweight BMI, 38.2% in obese BMI). A maternal and sibling, but not paternal, family history of diabetes was also a statistically significant risk factor. GIGT appears to be a definite risk factor for the development of carbohydrate metabolism problems later on in life, this being related to the severity during pregnancy and the presence or development of obesity. It is proposed that women diagnosed to suffer from GIGT should be regularly monitored after the pregnancy, particularly if other risk factors such as obesity are also present.