Next Tuesday, May 31, I am scheduled for an abd. and pelvic Ultrasound with contrast dye. I am having problems with my colon. Anyway, I was told to not take my Metformin the morning of the test and for 72 hours after the procedure because the Metformin reacts with the contrast dye. No one told me how to keep my BGL's in check during this time. Has anyone had contrast dye during a procedure and if so what happened with your blood sugar? Thank you for your answers.