A system and method for measuring a voltage in a body part are described. The system includes a multiplexing unit, and N body leads for electrically connecting the multiplexing unit to the body part. The system also includes a controller switching unit for allowing a current to flow through the body part between two body leads, n.sub.1 and n.sub.2 of the N body leads, and a resultant voltage to be measured between two body leads, n.sub.3 and n.sub.4 of the N body leads, where n.sub.1.noteq.n.sub.2 and n.sub.3.noteq.n.sub.4, but where n.sub.1 n.sub.2 n.sub.3 and n.sub.4 need not otherwise be distinct.