| Abbreviations | Meaning |
 | CA 72.4 | Marker For Gastrointestinal And Ovarian Carcinomas |
| TSIA | Total Small Intestine Allotransplantation |
| IGC | Immature Germ Cell; Intragastric Cannula |
| GP | Gastric Pneumatosis |
| NBM | No Bowel Movement; Normal Bone Marrow; Normal Bowel Movement; Nothing By Mouth |
| GER | Gas Exchange Region; Gastroesophageal Reflux; Geriatrics; Granular Endoplasmic Reticulum |
| UGI | Upper Gastrointestinal [tract] |
| LGI | Large Glucagon Immunoreactivity; Low Gastrointestinal; Lower Gastrointestinal |
| BLEED | Bleeding (ongoing), Low Systolic Blood Pressure, Elevated Prothrombin Time, Erratic Mental Status, Disease (unstable Comorbid Disease) (mnemonic For Gastro-intestinal Hemorrhage) |
| MNGIE | Myo-, Neuro-, Gastrointestinal Encephalopathy |
| GES | Gastroesophageal Sphincter; Glucose-electrolyte Solution |
| FIFR | Fasting Intestinal Flow Rate |
| GU | Gastric Ulcer; Genitourinary; Glucose Uptake; Glycogenic Unit; Gonococcal Urethritis; Gravitational Ulcer; Guanethidine |
| CIA | Chemiluminescent Immunoassay; Chymotrypsin Inhibitor Activity; Colony-inhibiting Activity; Congenital Intestinal Aganglionosis |
| GED | Gastric Epithelial Dysplasia |
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