FIELD: medicine, surgery. SUBSTANCE: method deals with incubation of tested conventional samples of sutures in gall bladder bile under sterile conditions at 37 C for a day followed by microscopy and calculating places for absorption of biliary elements along end surfaces of material. Then their average statistical amount is determined per a unit of suture length to conclude on cholelithogenic properties of sutures in vitro. EFFECT: shortened period of research. 21 dwg