| Abbreviations | Meaning |
 | NBM | No Bowel Movement; Normal Bone Marrow; Normal Bowel Movement; Nothing By Mouth |
| MMIH | Megacystis-microcolon-intestinal Hypoperistalsis [syndrome] |
| GIS | Gas In Stomach; Gastrointestinal Series; Geographic Information System; Guaranteed Income Supplement |
| CIBD | Chronic Inflammatory Bowel Disease |
| ASGE | American Society For Gastrointestinal Endoscopy |
| LGI | (see GI) Lower Gastro-intestinal Tract |
| RDG | Retrograde Duodenogastroscopy |
| IIP | Idiopathic Interstitial Pneumonia; Idiopathic Intestinal Pseudo-obstruction; Increased Intracranial Pressure |
| GE | Gastric Empyting |
| CIPSO | Chronic Intestinal Pseudo-obstruction |
| PGV | Proximal Gastric Vagotomy |
| GITSG | Gastrointestinal Tumor Study Group |
| GEP | Gastroenteropancreatic; Gustatory Evoked Potential |
| UG | Geometric Unsharpness; Urogastrone; Urogenital |
| GM | Gastric Mucosa |
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