IL6 and systemic inflammatory response syndrome: The highest IL-6 median serum concentration was reported in the SIRS group (32.6 pg/ml (13.8-94.0 pg/ml)), followed by the sepsis and N-SIRS groups (26.4 pg/ml (11.5-71.4 pg/ml) and 18.1 pg/ml (8.5-29.2 pg/ml), respectively).