[The isoenzyme pattern of serum alkaline phosphatase in patients on intermittent haemodialysis and kidney transplant recipients (author's transl)].

The total activity and the isoenzyme fractions of alkaline phosphatase were determined in the serum of 15 patients on intermittent haemodialysis and 32 kidney transplant recipients. The isoenzymes of alkaline phosphatase were separated by polyacrylamide gel disc electrophoresis. It was apparent that the increased activity of serum alkaline phosphatase in these patients was not limited to a distinct isoenzyme fraction. 5 of the 15 dialysis patients and 19 (59%) of the 32 kidney transplant patients showed a bone-type isoenzyme pattern. The possible causes for the presence of a bone-type alkaline phosphatase pattern are discussed. The fractionation of alkaline phosphatase gives a valuable indication as to the organ of origin of the particular fraction and is also of diagnostic value when the total activity of alkaline phosphatase lies within the normal range.