Aims: To investigate how glucose levels at diagnosis of gestational diabetes (GDM) are associated with infant birth weight and long-term risk of manifest diabetes mellitus in the mother. Methods: In a case control study GDM pregnancies (n = 2085) were compared with non-GDM pregnancies matched for day of delivery and obstetric unit (n = 3792). GDM was defined as capillary blood glucose (cB-glucose) >9.0 mmol/l (plasma glucose >10.0 mmol/l) after a 75 g oral glucose tolerance test (OGTT). The GDM cohort were followed up 8.5-13.5 yrs after initial diagnosis with a questionnaire, answered by 1324 GDM women (65%). Results: GDM women had higher mean infant birth-weight compared with controls (3682 g vs. 3541 g, P < 0.001). In multiple linear regression analysis, birth weight was positively correlated to fasting cB-glucose at GDM diagnosis (P < 0.001), increased week of gestation (P < 0.001) and BMI before pregnancy (P < 0.003), while 2 h OGTT cB-glucose values >= 9.0 mmol/l were not related. Infants born to mothers with fasting cB-glucose >= 4.5 mmol/l had no increased mean birth-weight or macrosomia (>= 4500 g) compared to controls. In the follow up 334/1324 women (25%) of the GDM women had developed diabetes, 215 type 2 diabetes, 46 type 1 diabetes and 72 unclassified diabetes. In logistic regression fasting cB-glucose and 2 h OGTT cB-glucose at diagnosis of GDM as well as BMI >25 and origin outside Europe were risk factors for manifest diabetes. Conclusions: Fasting blood glucose at diagnosis of GDM gives important information besides 2 h OGTT glucose about pregnancy outcome and future risk for maternal diabetes.
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Obstetrics, Gynecology and Reproductive Medicine (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Reproduktionsmedicin och gynekologi (hsv//swe)
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine (hsv//eng)