TrialNet Pathway to Prevention of T1D is a study to understand and prevent type 1 diabetes (T1D). T1D is a condition where the body can't make insulin, a hormone that helps control blood sugar. This study is for relatives of people with T1D, as they have a higher risk of developing the disease. Participants will first have a simple blood test to check for special proteins, called autoantibodies, which can show early signs of T1D. If these proteins are found, more tests will be done to see the risk of developing T1D in the next 5 years. The study involves follow-up visits, either yearly or twice a year, depending on the results. Participants will be monitored for any signs of T1D and offered to join other prevention studies if needed.

• Participants will receive results within 4-6 weeks.
• Study involves a blood test and follow-up visits.
• Open to relatives of T1D patients aged 2-45 years.