| Abbreviations | Meaning |
 | GOR | Gastroesophageal Reflux |
| GR | Gastric Resection |
| HGM | Hog Gastric Mucosa; Human Gene Mapping; Human Glucose Monitoring |
| HIPO | Hemihypertrophy, Intestinal Web, Preauricular Skin Tag, And Congenital Corneal Opacity [syndrome]; Hospital Indicator For Physicians Orders |
| GBS | Gastric Bypass Surgery |
| I-TYPE | Intestinal Type |
| GEF | Gastroesophageal Fundoplication; Glossoepiglottic Fold; Gonadotropin Enhancing Factor; Guanosine Nucleotide Exchange Factor |
| GA | Gastric Analysis; General Appearance |
| GIS | Gas In Stomach; Gastrointestinal Series; Geographic Information System; Guaranteed Income Supplement |
| GBD | Granulomatous Bowel Disease |
| PEG | Patient Evaluation Grid; Percutaneous Endoscopic Gastrostomy; Pneumoencephalogram, Pneumoencephalography; Polyethylene Glycol |
| PG | Percutaneous Gastrostomy |
| GP | Gastroplasty |
| IPSID | Immunoproliferative Small Intestine Disease |
| TGE | Transmissible Gastroenteritis |
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