Six studies were included in the review. Patients with bloodeosinophilia had significantly shorter hospital stay compared to non-eosinophilic patients (mean difference 0.68 days [95% CI 1.09,0.27]). Eosinophilic patients had significantly less frequent readmissions (OR 0.69 [95% CI 0.55,0.87]) but there was no statistically significant difference in the one-year mortality rate (OR 0.88 [95% CI 0.73, .06]). Analysis showed a trend toward lower in-patientmortality among eosinophilic patients (OR 0.53 [95% CI 0.27,1.05]). Furthermore, COPDpatients with eosinophilia had significantly less need for mechanical ventilation during an exacerbation (OR 0.56 [95% CI 0.35,0.89]).