DD just had her first HI reading ever. She washed her hands and checked again, and it was still HI. I wasn't here, but my dh changed her set and gave a correction. She was on her first Mio ever (6 mm, on her bum), and we suspect it went bad or pulled partway out; when he changed it, he put in a Silhouette, which is what she's always used before. I think he then gave a correction based on an assumed BG of 600. Checked blood ketones and head a measurement of 0.2, so no immediate problem there. So here are the questions: - If the meter reads HI, how do you calculate the correction? - Do you do anything else besides change the set and encourage water?