IL6 and COVID-19: Previous studies have reported that several other biomarkers could indicate disease severity and mortality in COVID-19, including inflammatory markers (erythrocyte sedimentation rate and interleukin 6), coagulation indicators (fibrinogen and D-dimer), and routine blood variables (platelet count and platelet distribution width) (Ponti et al., 2020; Semiz, 2022; Ligi et al., 2023).