Abstract: The invention relates to assay methods and kits for assessing autoimmune diseases in a human subject. In embodiments, the present disclosure provides assay methods and kits for diagnosing a subject with or predicting that a subject will develop Type 1 diabetes. In embodiments, the present disclosure provides assay methods and kits for assessing responsiveness of a subject having Type 1 diabetes to treatment with alefacept. In embodiments, the present disclosure provides assay methods and kits for diagnosing a subject with systemic lupus erythematosus. In embodiments, the present disclosure provides assay methods and kits for determining if a subject is at risk of a systemic lupus erythematosus flare. In embodiments, the present disclosure provides assay methods and kits for diagnosing a subject with celiac disease.