Abstract
AIMS: To investigate the performance of early pregnancy HbA1c for predicting gestational diabetes mellitus (GDM) and adverse pregnancy outcomes in obese women.
METHODS: Post hoc analysis using data from the Vitamin D And Lifestyle Intervention for GDM prevention trials conducted across 9 European countries (2012-2014). Pregnant women (BMI ≥ 29 kg/m2) underwent a baseline HbA1c and oral glucose tolerance tests at < 20 weeks, 24-28 weeks, and 35-37 weeks. Women with GDM were referred for treatment.
RESULTS: Among the 869 women tested, the prevalence of GDM was 25.9% before 20 weeks, with a further 8.6% at 24-28 weeks. The areas under the curves for HbA1c at the two time points were 0.55 (0.50-0.59) and 0.54 (0.47-0.61), respectively. An early HbA1c ≥ 5.7% (39 mmol/mol) (N = 111) showed low sensitivity (18.2%) with 89.1% specificity for GDM before 20 weeks, at 24-28 weeks (sensitivity of 8.0% and specificity of 88.6% after excluding early GDM), and throughout gestation (sensitivity of 15.9% and specificity of 89.4%). The ≥ 5.7% (39 mmol/mol) threshold was significantly associated with concurrent GDM before 20 weeks (adjusted OR (aOR) 2.77(1.39-5.51)) and throughout gestation (aOR 1.72 (1.02-2.89)), but not adverse pregnancy outcomes.
CONCLUSIONS: Early pregnancy HbA1c is of limited use for predicting either GDM or adverse outcomes in overweight/obese European women.
| Original language | English |
|---|---|
| Article number | 108378 |
| Journal | Diabetes Research and Clinical Practice |
| Volume | 168 |
| Pages (from-to) | 108378 |
| ISSN | 0168-8227 |
| DOIs | |
| Publication status | Published - Oct 2020 |
Keywords
- Diagnostic threshold
- Gestational diabetes mellitus
- Hemoglobin A
- Odds Ratio
- Pregnancy
- Pregnancy outcome
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