[en] The aim of this study is to examine in a normal subject various subfractions of leukocyte blood along with plasma, for their trace element concentration. This is in order to establish a reliable technique for separation and analysis which can be applied to the determination of elemental concentrations in leukocyte subfractions from patients undergoing heart by-pass surgery. Instrumental neutron activation analysis (INAA) analysis was the simultaneous, multielemental technique employed to determine the concentrations of elements. Results from these investigations are presented along with possibilities for further work