| Abbreviations | Meaning |
 | UGI | (see GI) Upper Gastrointestinal |
| OG | Obstetrics And Gynecology; Occlusogingival; 1-O-octyl-beta-D-glucopyranoside; Oligodendrocyte; Optic Ganglion; Orange Green; Orogastric; [protective] Overgarment |
| NBM | No Bowel Movement; Normal Bone Marrow; Normal Bowel Movement; Nothing By Mouth |
| GCA | Gastric Cancer Area; Giant Cell Arteritis |
| LGI | (see GI) Lower Gastro-intestinal Tract |
| IO | Intestinal Obstruction |
| PGS | Postsurgical Gastroparesis Syndrome |
| SIM | Specialized Intestinal Metaplasia |
| GIF | Gastric Intrinsic Factor; Gonadotropin-inhibiting Factor; Graphic Interchange Format [imaging]; Growth Hormone-inhibiting Factor |
| SBS | Short Bowel Syndrome |
| CRIP | Cysteine-rich Intestinal Protein |
| N-CAP | Nifedipine Gastrointestinal Therapeutic System Circadian Anti-Ischemic Program |
| GES | Gastroesophageal Sphincter; Glucose-electrolyte Solution |
| GTB | Gastrointestinal Tract Bleeding |
| WBI | Web-based Instruction [telemedicine]; Whole Bowel Irrigation |
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