G
| G | Gravida (pregnant) |
| GB | Gallbladder |
| GBP | Gastric bypass |
| GBS | Gallbladder series (x-ray studies) |
| GC | Gonococcus (Neisseria gonorrhoeae) |
| G-CSF | Granulocyte-colony-stimulating factor |
| GER | Gastroesophageal reflux |
| GERD | Gastroesophageal reflux disease |
| GH | Growth hormone |
| GI | Gastrointestinal |
| GTT | Glucose tolerance test |
| GU | Genitourinary |
| GVHD | Graft-versus-host disease |
| GVHR | Graft-versus-host reaction |
| GYN | Gynecology |
