The goal of this clinical trial is to understand how many individuals who previously participated in the Indiana Biobank will return a type 1 diabetes home screening kit based upon different methods of recruitment communication. The main question it aims to answer is:

What form of recruitment communication is most effective for completing a type 1diabetes home screening kit?

Researchers will compare two types of recruitment contact: email and mail based communication (low-touch) versus phone contact and follow-up by a research team member (high-touch).

Participants will be contacted either via email/mail or by phone and asked if they want to complete a type 1 diabetes home screening kit.

Inclusion Criteria:

• Participant must be in Indiana Biobank
• Participant must be able to provide consent
• Ages 1-99 including pregnant women

Exclusion Criteria:

• Refusal to sign informed consent for home screening is exclusionary for the home screening portion of the study
• While other medical conditions are allowable prior diabetes diagnosis is exclusionary for home autoantibody screening

Participant results will be shared as summary data but because participants declining consent have not agreed we will not provide individual level data.