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Forrest classification[12] and the risk of re-bleeding within 24 h after exclusively medical therapy
| Re-bleeding risk (%) | |
| Acute bleeding | |
| Forrest I a (spurting bleeding) | 90 |
| Forrest I b (oozing bleeding) | 50 |
| Signs of recent bleeding | |
| Forrest II a (visible vessel) | 25-30 |
| Forrest II b (adherent clot) | 10-20 |
| Forrest II c (flat pigmented haematin on ulcer base) | 7-10 |
| Lesions without active bleeding | |
| Forrest III (lesions without signs of recent bleeding or fibrin-covered clean ulcer base) | 3-5 |
