Bioimpedance is the response of a living organism to an externally applied electric current. It is a measure of the opposition to the flow of that electric current through the tissues, the opposite of electrical conductivity. Measurement of bioimpedance in humans and animals " also referred to as bioelectrical impedance analysis – has proved useful as a non-invasive method for measuring such things as blood flow and body composition. Measurement of bioimpedance in humans and animals – also referred to as bioelectrical impedance analysis – has proved useful as a non-invasive method for measuring such things as blood flow and body composition.