IL6 and COVID-19: The results suggested that the area under the curve (AUC) for predicting severe COVID‐19 using HBP, IL‐6, CRP, and HBP/IL‐6/CRP combination was 0.895 (95% CI: 0.853–0.938), 0.710 (95% CI: 0.641–0.780), 0.869 (95% CI: 0.821–0.917), and 0.947 (95% CI: 0.919–0.976), respectively.