Table 4.
Indications for colonoscopy and diagnostic yield according to the American Society for Gastrointestinal Endoscopy guidelines n (%)
| ASGE Indication | Frequency | Relevant lesions (%) | P |
| Appropriate indication | 337 (82.6) | 24.3 | |
| Follow-up of colonic polyps | 79 (19.4) | 21.5 | 0.879 |
| Excision of colonic polyp | 71 (17.4) | 42.3 | < 0.0001 |
| Screening for colonic neoplasia | 52 (12.7) | 7.7 | 0.010 |
| Hematochezia | 36 (8.8) | 30.6 | 0.197 |
| Follow-up for colorectal cancer | 31 (7.6) | 9.7 | 0.166 |
| Diarrhea | 30 (7.4) | 16.7 | 0.647 |
| Iron deficiency anemia | 20 (4.9) | 5.0 | 0.090 |
| Follow-up for inflammatory bowel disease | 12 (2.9) | 100 | < 0.0001 |
| Evaluation of an imaging study abnormality that is likely to be clinically significant | 10 (2.5) | 0.0 | 0.129 |
| Presence of fecal occult blood | 9 (2.2) | 44.4 | 0.098 |
| Evaluation for synchronous cancer or neoplastic polyps | 4 (1.0) | 100 | 0.002 |
| Uncertain indication | 10 (2.4) | 20.0 | |
| Anemia not otherwise characterized | 10 (2.4) | 20.0 | 1.000 |
| Inappropriate indication | 61 (15.0) | 3.3 | |
| Abdominal pain | 50 (12.3) | 6.0 | 0.005 |
| Chronic constipation | 18 (4.4) | 5.5 | 0.006 |
| Unexplained weight loss | 6 (1.5) | 0.0 | < 0.0001 |
| Others | 14 (3.4) | 0.0 | < 0.0001 |
ASGE: American Society for Gastrointestinal Endoscopy.