| Abbreviations | Meaning |
 | LGIB | Low Gastrointestinal Bleeding |
| GU | Gastric Ulcer; Genitourinary; Glucose Uptake; Glycogenic Unit; Gonococcal Urethritis; Gravitational Ulcer; Guanethidine |
| GO | Gastro-[o]esophageal; Geroderma Osteodysplastica; Glutamic Oxylacetic [acid]; Gonorrhea; Glucose Oxidase |
| FIFR | Fasting Intestinal Flow Rate |
| GEP | Gastroenteropancreatic; Gustatory Evoked Potential |
| GDU | Gastroduodenal Ulcer |
| I-TYPE | Intestinal Type |
| GD | Gastroparesis Diabeticorum |
| SBS | Short Bowel Syndrome |
| GES | Gastroesophageal Sphincter; Glucose-electrolyte Solution |
| GR | Gastric Resection; Great, Greater; Gross, Grossly; Group |
| UGIH | Upper Gastrointestinal Hemorrhage |
| SBO | Small Bowel Obstruction |
| SIMA | Small Intestinal Mucinous Antigen |
| UGI | (see GI) Upper Gastrointestinal |
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