950-P: Validity of Self-Reported Blood Glucose Values in Pregnancy

Objective: To determine whether there is a difference in self-reported blood glucose values and glucometer electronic downloads for women with diabetes during pregnancy.

Study Design: A retrospective cohort study was conducted of pregnant women with pre-existing or gestational diabetes presenting with both self-reported blood glucose logs and at least one Glooko glucometer electronic download (gold standard) for the same time period. Patients with continuous glucose monitor use were excluded. Linear regression was used to model fasting, pre-, and post-prandial sampling throughout the day. The fitted coefficient, intercept and mean, were used to calculate the daily mean value by self-report and Glooko. Values were compared with Student’s t-test.

Results: Thirty-three patients met study criteria. The daily mean value, calculated by the fitted coefficients, was significantly lower by self-report than by Glooko (p=0.03).

Conclusion: Self-reported blood glucose logs underreport blood glucose values compared to electronic glucometer downloads, which has significant implications for clinical management and achieving tight glycemic control during pregnancy.

Figure: A and C. Daily mean values after linear regression for each patient by self-report (blue) and Glooko (red). B and D. Frequency of differences in glucose values.

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