| IBD | IBD Differentiation Panel (RPS) |
| IBU | Ibuprofen (RPS) |
| AERA | IgE Receptor Ab (RPS) |
| IGGSCP | IGG Subclasses 1 - 4 with IGG (RPS) [i] |
| PCRIG | IGH Gene Rearrangement Analysis (RPS) |
| IGHVM | IGHV Mutation Analysis by Sequencing (RPS) |
| IMIPM | Imipenem, Serum |
| IMI | Imipramine & Desipramine (RPS) |
| IPF | Immature Platelet Fraction |
| IBDPE | Immunobullous Disease Panel, Epithelial (ARUP via RPS) |
| UIEP24R | Immunofixation & Protein Electro, 24 Hr Urine (RPS) |
| UIEPR | Immunofixation & Protein Electro, Random urine |
| IEPRR | Immunofixation & Serum Protein Electrophoresis (RPS) |
| IFEU | Immunofixation 24 hour urine (RPS) |
| IMFXLR | Immunofixation Elect (LCH 001686) Cryoglobulin reflex only |
| IMFSC | Immunofixation, CSF (QUEST via RPS) |
| IGA | Immunoglobulin A (IgA) (RPS) |
| IGAS | Immunoglobulin A, Subclasses (1 & 2) (RPS) |
| IGDR | Immunoglobulin D (IgD) (RPS) |
| IMGLBE | Immunoglobulin E (IgE) (RPS) |
| FLCS | Immunoglobulin Free Light Chains, Serum (MAYO via RPS) |
| IGG | Immunoglobulin G (IgG) (RPS) |
| IGGIS | Immunoglobulin G (IgG) Index & Synthesis Rate (RPS) |
| IGS4 | Immunoglobulin G (IgG) Subclass 4 (RPS) |
| IGSC | Immunoglobulin G (IgG) Subclasses (1,2,3,4) (RPS) |
| IGGC | Immunoglobulin G (IgG), CSF (RPS) |
| IGMRPS | Immunoglobulin M (IgM) (RPS) |
| IGMC | Immunoglobulin M (IgM), CSF (RPS) |
| TLCU | Immunoglobulin Total Light Chains, Urine (MAYO via RPS) |
| QIGR | Immunoglobulins (IgA, IgG, IgM), Quantitative (RPS) |
| IMMG | Immunoglobulins (IgG,IgA,IgM) (MAYO via RPS) |
| GAMCSF | Immunoglobulins, CSF Quantitative (RPS) |
| ITS | Immunotyping w/Interpretation, Serum (RPS) |
| INDCN | Indicans, Urine Qualitative (RPS) |
| IFXPAN | Infliximab & Antibodies to Infliximab Quant (RPS ONLY) |
| INFXR | Infliximab Quant w/reflex to Antibodies to Infliximab, Serum (RPS) |
| H5PCR | Influenza A (H5) Virus by Qualitative NAAT (ARUP via RPS) |
| INHIBA | Inhibin A (DIMER) (RPS) |
| IHBNB | Inhibin B (RPS) |
| IE68 | Inner Ear 68KD (Heat Shock Protein 70), IgG (RPS) |
| FINRM | INR (PSPC) |
| IEXP | Insecticide Exposure Panel (ARUP via RPS) |
| INS | Insulin (RPS) |
| INSA | Insulin Antibody (RPS) |
| SOM | Insulin-Like Growth Factor 1 (Somatomedin C) (RPS) |
| IGFBP1 | Insulin-Like Growth Factor Binding Protein 1 (IGFBP-1) (RPS) |
| IGFBP2 | Insulin-Like Growth Factor Binding Protein 2 (IGFBP-2) (RPS) |
| IGF3 | Insulin-Like Growth Factor Binding Protein 3 (IGFBP-3) (RPS) |
| IFT | Insulin, Free and Total (RPS) |
| INSR | Insulin, Random (ARUP via RPS) |
| IFGF23 | Intact Fibroblast Growth Factor 23 (FGF23), Serum (ARUP via RPS) |
| IFNA | Interferon Alpha (Serum) by EIA (RPS sends to ARUP) |
| IBNAR | Interferon Beta Neutralzing Ab w/ reflex to titer (ARUP via RPS) |
| IFGAM | Interferon gamma, Serum (ARUP via RPS) |
| IL1B | Interleukin 1 beta, Serum (ARUP via RPS) |
| IL1A | Interleukin 1-Alpha |
| IKN10 | Interleukin 10 (RPS) |
| IKN12 | Interleukin 12 (RPS) |
| ILKN2 | Interleukin 2 (RPS) |
| IL2EL | Interleukin 2 ELISA (RPS ARUP 99230) |
| IKN2 | Interleukin 2 Receptor (CD25), Soluble (RPS) |
| ILKN4 | Interleukin 4 (RPS) |
| IL5S | Interleukin 5, Serum (ARUP via RPS) |
| IKN6 | Interleukin 6 (RPS) |
| INTRF | Intrinsic Factor Blocking Antibody (RPS) |
| IDNEP | Iodine, Serum (RPS) |
| IDNE | Iodine, Urine, Random or 24 Hour (RPS) |
| CAI | Ionized Calcium |
| FE | Iron |
| IIBC | Iron & Iron Binding Cap |
| FEPR | Iron Profile |
| FEU24 | Iron, 24 Hour Urine (NMS via RPS) |
| ISAG2 | Islet Antigen-2 (IA-2) Autoantibody, Serum |
| ICAG | Islet Cell Antibody IgG (RPS) |
| ISOT | Isohemagglutinin Titer, IgG & IgM (RPS) |
| ISPA | Isopropanol Alcohol |
| ITCNL | Itraconazole (RPS) |
