In this paper the analytical method of the pH, rH2 and specific resistance of body fluids with B.E.-VINCENT Unit was described. From the values of the pH, rH2 and specific resistance, other three bioelectronic factors, the redox potential, milliampere and micro-watts, were calculated. With this technique the bioelectronic factors of arterial and venous blood and urine obtained from 20 young healthy adults were examined. Those of arterial and venous blood showed almost identical values. The urinary values of the pH, milliampere and microwatts varied as compared to those of blood. The bioelectronic factors of the various intravenous replacement solutions and blood components were considerably different from those of blood. It is considered that the bioelectronic factors of patient's blood should be checked repeatedly and maintained in an appropriate state when massive fluid therapy is required.