| Abbreviations | Meaning |
 | NG | Nasogastric; Neisseria Gonorrhoeae; Neoplastic Growth; New Growth; Nitroglycerin; Nodose Ganglion; No Growth; Not Given |
| RGC | Radio-gas Chromatography; Remnant Gastric Cancer; Retinal Ganglion Cell; Right Giant Cell |
| OGD | [o]esophago-gastro-duodenoscopy |
| IBDQ | Inflammatory Bowel Disease Questionnaire |
| MHI | Malignant Histiocytosis Of Intestine; Mental Health Index; Mental Health Inventory; Minor Head Injury |
| IBF | Immature Brown Fat; Immunoglobulin-binding Factor; Insall-Burstein-Freeman [total Knee Instrumentation]; Intestinal Blood Flow |
| GMB | Gastric Mucosal Barrier; Granulomembranous Body |
| SBFT | Small Bowel Follow Through Series |
| GBS | Gastric Bypass Surgery |
| BSA | Bowel Signs Active |
| UGI | (see GI) Upper Gastrointestinal |
| ECTA | Esophageal Gastric Tube Airway; Everyman's Contingency Table Analysis |
| UGIH | Upper Gastrointestinal Hemorrhage |
| UGIS | Upper Gastrointestinal Series |
| EGD | Esophagogastroduodenoscopy |
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