concerning the prediction of severity of AP, IL-6 in day 1 (with cut-off 113.36 pg / ml) had the sensitivity 81.25% and the specificity 84.64%, PPV 68.4% and NPV 91.7%, accuracy rate 88.8%, AUC 0.888 and respectively in day 3 (with cut-off 41.38 pg / ml were 87.5%; 87.18%; 73.7%; 4.4%; 86.7%; 0.867.