The present invention provides a method of assessing tissue oedema, in particular lymphoedema, by measuring bioelectrical impedance at a single frequency. Comparison of a single frequency bioelectrical impedance measurement taken at an anatomical region affected by tissue oedema to that taken at an anatomical region unaffected by tissue oedema is a reliable indicator of the presence or possible presence of lymphoedema. The present invention further provides an apparatus for determining the presence of tissue oedema.
