Ideal Blood Glucose Monitoring Schedule for Gestational Diabetes on Insulin and Diet Therapy

Monitoring Frequency and Timing

The American Diabetes Association recommends performing self-monitoring of blood glucose (SMBG) at least 4 times daily: fasting and 1-hour postprandial after each meal, for pregnant women with gestational diabetes on insulin therapy, with postprandial monitoring being superior to preprandial monitoring for achieving optimal outcomes 1, 2
Daily self-monitoring of blood glucose (SMBG) is the cornerstone of management and is superior to intermittent office monitoring 3
The American Diabetes Association explicitly recommends fasting glucose daily to guide basal insulin decisions 2
1-hour postprandial glucose after each meal (breakfast, lunch, dinner) is recommended 1, 4
Alternatively, 2-hour postprandial measurements can be used, though 1-hour monitoring is preferred 1, 4

The American Diabetes Association recommends target glucose values for women with GDM on insulin therapy: fasting 70-95 mg/dL (3.9-5.3 mmol/L) 4

CGM can be used as an adjunct to—not a replacement for—SMBG in gestational diabetes, and identifies nocturnal hyperglycemia missed by SMBG 1, 6
The target time in range (TIR) for pregnant women with type 1 diabetes using CGM is >70% in the range of 63-140 mg/dL (3.5-7.8 mmol/L) 4

Start with 4-point SMBG daily: fasting + 1-hour after breakfast, lunch, and dinner, as recommended by the American Diabetes Association 1, 2
If targets are consistently met, continue this schedule throughout pregnancy 1
If fasting glucose remains elevated (≥95 mg/dL) despite prandial insulin, add or adjust basal insulin (NPH at bedtime or long-acting analogue), as recommended by the American Diabetes Association 2
Maintain daily food records to correlate glucose patterns with carbohydrate intake and facilitate insulin adjustments, as recommended by the American Diabetes Association 7