IL6 and COVID-19: Similarly, IL-6 had an AUC of 0.72 (95%CI 0.59 to 0.86, p = 0.0273), with serum concentrations higher than 60 pg/mL having 70% sensitivity (95%CI 44.17% to 87.31%) and 60% specificity (95%CI 47.02% to 71.71%) for COVID-19 mortality.