Results: IL-6 level day 1 in severe AP (168.86 ± 70.65 pg / ml) was significantly higher than in mild AP (89.54 ± 28.81 pg / ml) and IL-6 day 3 in severe AP (58.64 ± 20.77 pg / ml) significantly higher than mild AP (29.73 ± 14.88 pg/ml).