| Abbreviation | Definition |
|---|---|
| IU | Immunizing unit |
| IU | International Unit |
| IU | IntraUterine |
| I-UAL | Internal Ultrasonic Assisted Liposuction |
| IUD | Incredibly Useless Device |
| IUD | Intrauterine Device |
| IUFD | Intra-Uterine Fetal Death |
| IUGR | Inter Uterine Growth Restriction |
| IUGR | Intra Uterine Growth Restriction |
| IUGR | intrauterine growth restriction |
| IUI | Intra Uterine Insemination |
| IUL | Inspiral Upper Limit |
| IUL | Intrauterine Life |
| IUO | Internal Urethral Orifice |
| IUP | Intra-Uterine Pregnancy |
| IUS | Intra Uterine System |
| IUS | intrauterine system |
| IUS | Intra-Uterine System |
| IUT | Intrauterine transfusion |
| IV | In Vitro |