965-P: Validity of Number of Daily Self-Reported Blood Glucose Values in Pregnancy

Objective: To determine the validity of number of self-reported glucose values for women with diabetes during pregnancy. Study Design: A retrospective cohort study 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 an overlapping time period. Patients using continuous glucose monitors were excluded. Average number of daily blood glucose values and matching ratio (matched daily self-reported values/total daily self-reported values) were calculated. Outcomes were compared using the Student’s t-test and Fisher’s exact test. Results: Thirty-three patients met study criteria. Mean number of daily glucose values was significantly higher by self-report (3.35/day, SD=0.95) than Glooko (2.63/day, SD=1.21) (p=0.01) (Figure A). Patients self-reporting >=3.5 values daily (N=19) had fewer recorded Glooko measurements (p=0.003) while those self-reporting Conclusion: Patients systematically over-report the number of blood glucose values taken daily. Higher levels of self-reported values may reflect a greater likelihood of phantom values. Figure A. Average daily blood glucose values by self-report and Glooko. B and C. Difference between self-report and Glooko for the patient who reported less/more than 3.5 values a day. Disclosure P. Zhao: None. J. P. Dillon: None. A. Visani: None. H. E. Duckham: None. E. B. Carter: None. Funding American Diabetes Association/Pathway to Stop Diabetes (1-19-ACE-02 to E.B.C.)