AIMS/INTRODUCTION: There is little information regarding how to use insulin degludec (D) when diabetic patients are preparing for total colonoscopy (TCS). MATERIALS AND METHODS: A total of 12 patients with type 2 diabetes treated with insulin D and scheduled to undergo TCS were enrolled in the present study. A continuous glucose monitoring device was attached to each patient for 4 days, from two evenings before TCS to the morning after the procedure. The patients fasted for 24 h, starting after 18.00 h the day before TCS. Insulin D was only discontinued the morning of the day TCS was carried out. RESULTS: No patients experienced hypoglycemia during the daytime fasting period (08.00-18.00 h the day of TCS); the hypoglycemic index, mean glucose level, and standard deviation were 0, 141.3 ± 31.5 mg/dL and 15.6 ± 6.5 mg/dL. The mean glucose level and standard deviation during the daytime fasting period were significantly lower than during the daytime control period (08.00-18.00 h the day before TCS; P = 0.003, P = 0.001, respectively). The mean fasting glucose and fasting plasma glucose levels were significantly correlated (r = 0.78, P = 0.002), as were both the mean glucose level and standard deviation during the daytime control period, and the change in the mean glucose level (fasting period minus control period; r = -0.79, P = 0.002, and r = -0.69, P = 0.01, respectively). CONCLUSIONS: Patients can safely undergo TCS when insulin D is discontinued only once on the day of the procedure.
