Test Directory: I Immunofixation, Serum Immunofluorescence: Direct, Skin Immunofluorescence: Indirect, Blood Immunoglobulin A, QuantitativeImmunoglobulin E (IgE), TotalImmunoglobulins, Quantitative, IgA, IgG, IgMImmunohistochemistry/In-Situ Hybridization (Technical Only) Immunological Fecal Occult Blood (iFOB) TestInsulin Autoantibodies (IAA) Insulin, SerumInsulin-Like Growth Factor 1 (IGF-1)Insulinoma Associated-2 Autoantibodies (IA-2A)Intraepidermal Nerve Density AnalysisIronIslet Cell AutoantibodiesIslet Cell Cytoplasmic Autoantibodies (ICA)Islet Cell Cytoplasmic/Insulin Autoantibodies