The infl uence of lead (5mg/kg b.w) and cadmium (2mg/kg b.w) after chronic treatment of the rabbits on serum protein is investigated. Signifi cantly raised content of the cholesterol, ASAT and ALAT; hypo-albuminemia and hyperbetaglobulinemia of the background of one hypoproteinemia and low A/G coeffi cient are established. On basis of obtained result can to show degree of liver parenchyma damage and as trial for used the hyperbeta-globulinemia (at chronic treatment with cadmium is stronger markedly) as indicator for delimitation of enteral from parenteral toxication, at that is noted hypergamma-globulinemia.