Insulin Management for Pregnant Women with Diabetes

Physiological Changes and Glycemic Targets

The American Diabetes Association recommends that insulin is the preferred medication for managing diabetes during pregnancy, as it does not cross the placenta to a measurable extent and is the safest option for both mother and fetus 1
Pregnancy causes significant changes in insulin physiology that require careful management, with enhanced insulin sensitivity in early pregnancy, increasing insulin resistance in the second trimester, and doubling of insulin requirements in the third trimester 2
The American College of Obstetricians and Gynecologists recommends blood glucose targets for pregnant women with diabetes, including fasting glucose levels of 70-95 mg/dL and one-hour postprandial glucose levels of 110-140 mg/dL 2
The American Diabetes Association recommends A1C targets during pregnancy, with an optimal target of <6% if achievable without significant hypoglycemia, and alternative targets of <6.5% or <7% if necessary to prevent hypoglycemia 1, 2

The Endocrine Society recommends that insulin is mandatory for management of type 1 diabetes in pregnancy, with both multiple daily injections and continuous subcutaneous insulin infusion being appropriate delivery strategies 3
The American Association of Clinical Endocrinologists recommends that continuous glucose monitoring is beneficial for improving glycemic control and reducing hypoglycemia risk in pregnant women with diabetes 2
The American Diabetes Association recommends that insulin dosing should be adjusted based on blood glucose monitoring results, carbohydrate intake, physical activity levels, and stage of pregnancy 1, 2

The American College of Obstetricians and Gynecologists recommends that both fasting and postprandial blood glucose monitoring are essential for achieving metabolic control in pregnant women with diabetes 4, 2
The Endocrine Society recommends that regular evaluation of insulin requirements is necessary as pregnancy progresses, with adjustments typically needed every 2-3 weeks 2
The American Association of Clinical Endocrinologists recommends that a rapid reduction in insulin requirements may indicate placental insufficiency and should prompt immediate medical evaluation 2, 5

The American Diabetes Association recommends that education on hypoglycemia prevention, recognition, and treatment is essential for pregnant women with diabetes and their family members 3
The American College of Obstetricians and Gynecologists recommends that consistent carbohydrate intake is important to match insulin dosing and avoid glucose fluctuations 1, 5

The Endocrine Society recommends that insulin requirements decrease dramatically after delivery of the placenta, and close monitoring and insulin dose adjustment are needed in the immediate postpartum period to prevent hypoglycemia 6, 3

The American Diabetes Association recommends using insulin formulations with established safety profiles in pregnancy, such as NPH, regular insulin, or rapid-acting insulin analogues like insulin aspart or lispro, instead of Tresiba (insulin degludec) 7, 8
The American Diabetes Association suggests that both multiple daily injections and continuous subcutaneous insulin infusion are acceptable delivery strategies during pregnancy 7, 8

The American Diabetes Association recommends targeting a 1-hour postprandial glucose level <140 mg/dL or a 2-hour postprandial glucose level <120 mg/dL when using appropriate insulin formulations 7
The American College of Obstetricians and Gynecologists and the American Diabetes Association suggest that insulin requirements change dramatically throughout pregnancy, and insulin resistance drops rapidly with placental delivery, requiring immediate postpartum dose reduction to prevent severe hypoglycemia 7, 9
The Endocrine Society notes that hypoglycemia risk increases in the first trimester with altered counterregulatory response, necessitating education for patients and family members 7, 9, 10
The American Diabetes Association recommends monitoring for diabetic ketoacidosis at lower glucose thresholds during pregnancy (<200-250 mg/dL vs typical >250 mg/dL), requiring ketone monitoring and patient education 7, 9