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Can we really diagnose diabetes during pregnancy?
Journal of Perinatal Medicine
|October 18, 2014
Summary
Antepartum glycosylated hemoglobin (HbA1c) ≥6.5% is not a clinically useful predictor for postpartum diabetes or glucose intolerance. This study found low positive predictive values for diagnosing these conditions after pregnancy.
Area of Science:
- Obstetrics and Gynecology
- Endocrinology
- Diabetes Research
Background:
- Gestational diabetes mellitus (GDM) increases the risk of future type 2 diabetes.
- Accurate postpartum screening is crucial for early detection and management of diabetes.
- Antepartum markers are being investigated for their predictive potential.
Purpose of the Study:
- To evaluate the diagnostic accuracy of antepartum glycosylated hemoglobin (HbA1c) and fasting glucose for postpartum diabetes and glucose intolerance.
- To determine the clinical utility of these antepartum markers in a Hawaiian cohort.
Main Methods:
- Retrospective analysis of a Hawaiian cohort of women with GDM (2004-2011).
- Collected antepartum HbA1c and postpartum 75-g oral glucose tolerance test (OGTT) data.
- Assessed sensitivity, specificity, and positive predictive values (PPV).
Main Results:
- An antepartum HbA1c ≥6.5% showed low sensitivity (45.7%) but high specificity (96%) for postpartum diabetes, with a 40% PPV.
- The same HbA1c threshold had very low sensitivity for predicting postpartum impaired glucose tolerance (6.6%) and impaired fasting glucose (10.3%).
- Positive predictive values for glucose intolerance were also low (27% and 33.3% respectively).
Conclusions:
- Antepartum HbA1c ≥6.5% and fasting glucose ≥90 mg/dL lack clinically useful positive predictive value for diagnosing postpartum diabetes or glucose intolerance.
- These antepartum markers are not sufficiently accurate for reliable postpartum screening in this population.
- Further research may be needed to identify more effective screening tools.
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