Type 1 diabetes is when the body can't make insulin, a hormone that helps sugar enter cells for energy. Celiac disease is when eating gluten (a protein found in wheat) harms the small intestine. Both diseases can have serious effects if not caught early. This study checks for special proteins called autoantibodies in children’s blood. These proteins can show if someone might develop these diseases before they get really sick.

In this study, they will use two ways to find autoantibodies: from a small blood spot on a card and from a blood test (serum). They want to see if these two ways give the same results. This could make it easier and faster to test people, especially kids.

• Participants are children aged 2-13 years.
• Parents must give their consent for their child to join.
• No known risks, and no children will be excluded once consent is given.