| IUP | intrauterine pregnancy; intrauterine pressure |
|---|---|
| IUPAC | International Union of Pure and Applied Chemistry |
| IUPAP | International Union of Pure and Applied Physics |
| IUPAT | intrauterine pregnancy at term |
| IUPD | intrauterine pregnancy delivered |
| IUPHAR | International Union of Pharmacology |
| IUPS | International Union of Physiological Sciences |
| IUPTB | intrauterine pregnancy, term birth |