Testing a Conversion Factor for a More Rapidly Acting Insulin in an Automated Insulin Delivery System Among Adolescents With T1D

This study is exploring a more precise way to dose fast-acting insulin for teenagers and young adults who use an automated insulin pump system called the Tandem t:slim with Control-IQ Technology. The goal is to find the best conversion factor when switching to a faster insulin, so that blood sugar levels stay in range more effectively. **You may be eligible if...** - You are between 12 and 22 years old - You have had type 1 diabetes for at least one year - Your HbA1c (a measure of average blood sugar) is between 6.5% and 12% - You currently use the Tandem t:slim pump with Control-IQ Technology for at least 2 months - You have internet access and can upload pump data during the study - You are not currently pregnant or breastfeeding (if female) **You may NOT be eligible if...** - You do not use the specific Tandem t:slim Control-IQ pump system - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.