Postpartum Glucose Monitoring and Insulin Management for Pregestational Diabetes

Introduction to Postpartum Care

For patients with pregestational diabetes who were on insulin during pregnancy, insulin requirements decrease dramatically immediately postpartum to approximately 34% lower than prepregnancy requirements, with insulin sensitivity returning to prepregnancy levels over 1-2 weeks, as recommended by the American Diabetes Association 1

The American Diabetes Association recommends resuming the basal-bolus insulin scheme immediately after delivery, with a significant reduction in insulin dosage, using either 80% of pre-pregnancy insulin doses or 50% of the doses used at the end of pregnancy, for patients with Type 1 diabetes 2, 3
Never discontinue basal insulin in Type 1 diabetes patients due to high risk of ketoacidosis, as advised by the American Diabetes Association 3, 4
Target blood glucose range should be 6-8.8 mmol/L (110-160 mg/dL) after vaginal delivery, with slightly lower targets after cesarean section to support wound healing, as recommended by the American College of Obstetricians and Gynecologists 2, 3

Check fasting and 2-hour postprandial glucose levels at least 4 times daily during the first week, as recommended by the American Diabetes Association 2, 5
Pay particular attention to hypoglycemia prevention, especially in the setting of breastfeeding and erratic sleep and eating schedules, as advised by the Endocrine Society 5, 1

Insulin sensitivity returns to prepregnancy levels over 1-2 weeks after delivery, as reported by the American Diabetes Association 5, 1
Adjust insulin doses based on blood glucose patterns, with the expectation that requirements will gradually increase toward prepregnancy levels, as recommended by the American Association of Clinical Endocrinologists 1

Schedule a comprehensive diabetology evaluation before discharge from postpartum care, including HbA1c, fasting blood glucose, and 75g oral glucose tolerance test (OGTT) using non-pregnancy criteria, as recommended by the American College of Obstetricians and Gynecologists 2, 4, 6
OGTT is recommended over HbA1c at 4-12 weeks postpartum because HbA1c may be persistently impacted (lowered) by increased red blood cell turnover related to pregnancy and blood loss at delivery, as advised by the American Diabetes Association 5, 6

Support all women with diabetes in attempts to breastfeed, as recommended by the American Academy of Pediatrics 6
Be aware that lactation increases the risk of overnight hypoglycemia and may require insulin dose adjustments, as advised by the Endocrine Society 1, 6
Discuss and implement a contraceptive plan with all women with diabetes of reproductive potential, as recommended by the American College of Obstetricians and Gynecologists 1, 6

Never discontinue basal insulin in Type 1 diabetes patients - this can lead to rapid development of ketoacidosis, as warned by the American Diabetes Association 2, 3
Avoid excessive insulin dosing - insulin requirements drop dramatically after placental delivery, as advised by the American Association of Clinical Endocrinologists 5, 1
Don't overlook hypoglycemia risk - especially during breastfeeding and with irregular sleep patterns, as cautioned by the Endocrine Society 1, 6
Don't delay postpartum testing - schedule the 75g OGTT at 4-12 weeks postpartum to evaluate for persistent diabetes, as recommended by the American Diabetes Association 5, 6