| 2070 | IEP Panel |
| 2149 | IEP Urine |
| 91334 | IF Blocking Antibody |
| 2326 | IgA |
| 2274 | IgE |
| 91140 | IGF BP-3 |
| 5018 | IGF-1 |
| 91147 | IGF-II |
| 2325 | IgG |
| 91143 | IgG Subclasses |
| 2327 | IgM |
| 91142 | Imipramine |
| 91036 | Immune Complex |
| 80801 | Immunocap, Adult Food Profile |
| 80804 | Immunocap, Pediatric Food Panel |
| 80802 | Immunocap, Pediatric Profile |
| 80800 | Immunocap, Upper Respiratory Profile |
| 91212 | Immunodeficiency Panel |
| 2070 | Immunofixation Electrophoresis Panel |
| 2149 | Immunofixation Electrophoresis, Urine |
| 2326 | Immunoglobulin A |
| 2274 | Immunoglobulin E |
| 2325 | Immunoglobulin G |
| 91143 | Immunoglobulin G Subclasses |
| 2327 | Immunoglobulin M |
| 1430 | Immunoglobulin Panel (IgA, IgG, IgM) |
| 4401 | India Ink Prep |
| 3838 | Indirect Coombs |
| 91305 | Infections Evaluation, IgG |
| 91349 | Infections Evaluation, IgM |
| 1856 | Infectious Mono Viral Panel |
| 2335 | Infectious Mononucleosis |
| 2472 | Influenza A,B [DFA] |
| 2467 | Influenza A,B [Rapid] |
| 91145 | Inhibin-A [Dimer] |
| 91414 | Inner Ear Antibody |
| 1012 | Inorganic Phosphate |
| 3500 | INR |
| 91412 | Insecticide Exposure Panel |
| 5018 | Insulin - Like Growth Factor 1 |
| 91140 | Insulin - Like Growth Factor Binding Protein 3 |
| 91147 | Insulin - Like Growth Factor II |
| 91146 | Insulin Antibody |
| 2226 | Insulin Tolerance, 2 HR |
| 2227 | Insulin, Fasting |
| 2228 | Insulin, Random |
| 91333 | Interleukin 2 |
| 3500 | International Normalized Ratio |
| 91334 | Intrinsic Factor Blocking Antibody |
| 2038 | Iron |
| 2040 | Iron and Total Iron Binding |
| 1448 | Iron Deficiency Panel |
| 91335 | Islet Cell Antibody, IgG |
| 2071 | Isoenzymes, LD |