IL6 and COVID-19: The median IL-6 concentration in critical COVID-19 was 55 pg/mL (Q1 = 31 pg/mL, Q3 = 120.88 pg/mL), while in non-critical COVID-19 the median concentration was 27.75 pg/mL (Q1 = 17 pg/mL, Q3 = 55.38 pg/mL).