Test Directory: I IgH Gene Rearrangements (B-Cell Clonality Analysis) Immunofixation, Serum Immunofluorescence: Direct, Skin Immunofluorescence: Indirect, Blood Immunoglobulin A, Quantitative Immunoglobulin E (IgE), Total Immunoglobulins, Quantitative, IgA, IgG, IgM Immunohistochemistry/In-Situ Hybridization (Technical Only) Immunological Fecal Occult Blood (iFOB) Test Insulin Autoantibodies (IAA) Insulin, Serum Insulin-Like Growth Factor 1 (IGF-1) Insulinoma Associated-2 Autoantibodies (IA-2A) Intraepidermal Nerve Density Analysis Iron Islet Cell Autoantibodies Islet Cell Cytoplasmic Autoantibodies (ICA) Islet Cell Cytoplasmic/Insulin Autoantibodies ITD, FLT3-ITD Gene Mutation Analysis