| Imipramine (drug abuse) |
| Indomethacine (drug abuse) |
| Isocarboxazid (drug abuse) |
| IgA |
| IgE |
| IgG |
| IgG index |
| IgG subclass 1 |
| IgG subclass 2 |
| IgG subclass 3 |
| IgG subclass 4 |
| IgM |
| IgF-1 |
| Immunoelectrophresis |
| Immunohistochemistry (IHC) |
| Inhibin B |
| Inhibin A |
| Insulin |
| Iron |
