Background: In this study, we aimed to examine demographic and endoscopic features of patients with GI bleeding to determine the factors a ecting 30-day mortality. Method: Patient's demographic features, laboratory outcomes, comorbidities, drug use, endoscopy outcomes, Glasgow-Blatchford scores, and mortality status were examined. e factors a ecting 30-day mortality were investigated.Results: e mean age of the patients was 58.2±17.4 years, and 72.1% were male patients. 30-day mortality rate was found to be 14.4%. e mean age of patients who died was high (p<0.05). e incidence of mortality was high in the presence of comorbidity, malignancy, and cirrhosis (p<0.05). Systolic blood pressure was low in the patients who died (p<0.05). No signi cant correlation was found between mortality and gender, symptoms, predisposing factors, lesion type and Forrest score, diastolic blood pressure and heart rate (p>0.05). Urea, neutrophils, red blood cell distribution width / platelet ratio, neutrophil / lymphocyte ratio and RDW levels were high, and hemoglobin level was signi cantly low in patients with a mortal progression (p<0.05). No signicant correlation was found between mortality, and platelet and lymphocyte levels (p>0.05). Glasgow-Blatchford score was signi cantly higher in patients who died (p<0.05). Conclusion: Many factors a ect 30-day mortality in GI bleeding. It should be remembered that follow-up of patients with an advanced age who have comorbidity and impaired hemodynamics should be kept for long, and that these patients are at a high risk for mortality.According to our results, NLR and RDW are independent factors that determine the 30-day mortality in upper GI bleeding.