An External Validation Study of the Oakland and Glasgow-Blatchford Scores for Predicting Adverse Outcomes of Acute Lower Gastrointestinal Bleeding in an Asian Population

Figure 1

Flowchart of patients recruited for this study. OGD: oesophagogastroduodenoscopy; ALGIB: acute lower gastrointestinal bleeding. Upper gastrointestinal bleeding to be excluded by OGD in patients who presented with (i) melena only or (ii) hematochezia and concomitant hemodynamic instability.