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Amniotic Fluid Insulin Values in Women with Gestational Diabetes as a Predictor of Emerging Diabetes Mellitus
Authors:T. Weerasiri MRCOG  FRACOG    S. F. Riley M App Sc.    M. T. Sheedy B App Sc.    J. E. Walstab BSc.   P. Wein FRACOG
Affiliation:Department of Obstetrics and Gynaecology, University of Melbourne, and Mercy Hospital for Women, Melbourne
Abstract:Summary: Amniotic fluid insulin levels were estimated in 30 women with insulin-dependent diabetes, 216 with gestational diabetes and 27 with normal glucose tolerance. Results were correlated with birth-weight, incidences of fetal macrosomia and neonatal hypoglycaemia, and the risk of the mothers with gestational diabetes developing diabetes mellitus on follow-up.
The women with prepregnaney diabetes had significantly higher amniotic fluid insulin values and showed a significant correlation between raised liquor insulin values (>97th percentile) and hypoglycaemia in the infant (p = 0.039).
In the gestational diabetic pregnancies there were highly significant associations between elevated liquor insulin values and macrosomia (p <0.0045) and birth-weight (p <0.00004), and a weak correlation with neonatal blood glucose levels (p = 0.042).
Women with gestational diabetes who later developed permanent diabetes mellitus had higher mean amniotic fluid insulin levels than those whose glucose tolerance remained normal on follow-up (p ≤0.0072) and more of them had a level greater than the 97th percentile than those whose glucose tolerance remained normal (odds ratio 6.48, 95% confidence interval 1.51–27.8, p = 0.0094). However a high amniotic fluid insulin level was of less clinical value for detection of women destined to develop diabetes (7 of 25, 28%) than was the need for insulin therapy during pregnancy (18 of 39, 46%) .
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