| Abbreviations | Meaning |
 | GA | Gastric Analysis |
| UGIB | Upper Gastrointestinal Biopsy |
| GIST | Gastrointestinal Stromal Tumor |
| PG | Percutaneous Gastrostomy |
| IBD | Identical-by-descent; Inflammatory Bowel Disease; Integrated Balloon Display; Irritable Bowel Disease |
| GITT | Gastrointestinal Transit Time; Glucose Insulin Tolerance Test |
| HIE | Human Intestinal Epithelium; Hyperimmunoglobulin E; Hypoxic-ischemic Encephalopathy |
| GP | Gastric Pneumatosis |
| GD | Gastroduodenal |
| MMIH | Megacystis-microcolon-intestinal Hypoperistalsis [syndrome] |
| GMBF | Gastric Mucosa Blood Flow |
| LBM | Last Bowel Movement; Lean Body Mass; Loose Bowel Movement; Lung Basement Membrane |
| SLUDGE | Salivation, Lacrimation, Urination, Defecation, Gastrointestinal Upset, Emesis |
| GIP | Gastric Inhibitory Polypeptide; Giant Cell Interstitial Pneumonia; Glucose-dependent Insulinotropic Peptide; Gonorrheal Invasive Peritonitis |
| SID | Selective Intestinal Decontamination |
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