| IAT- Indirect antiglobulin test (Coomb`s indirect) (serum) |
| Immunoglobulin G (IgG) (serum) |
| Immunoglobulin A (IgA) (serum) |
| Immunoglobulin E-total (IgE) (serum) |
| Immunoglobulin M (IgM) (serum) |
| India Ink Preparation (CSF) |
| Infectious Mononucleosis (Monospot) test (serum) |
| Insulin-fasting (serum) |
| Intact PTH-Para Thyroid Hormone (serum) |
| Iron (serum) |
