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Changes of proteinase-inhibitory system values in blood plasma of dogs with experimental acute pancreatitis (EAP) were studied in dynamics. Their diagnostic and prognostic values was appraised. Essential shifts were revealed in the proteinase-inhibitory balance in blood plasma of dogs with EAP of various severity. The concentration of trypsin- and chymotrypsin-like proteinases exceeded the normal values 1.8-3.3 times in these animals. Coefficients expressing the relation of antitryptic and antichymotryptic activities to the activities of the corresponding proteinases in the blood plasma of animals with EAP were indicative of diminished blood plasma inhibitory potential as compared to that in intact animals. The authors are the first to show the diagnostic and prognostic value of the antichymotryptic activity/chymotrypsin in blood plasma of dogs with EAP.