A method for diagnosing pregnancy-related complications in a pregnant woman. The method comprises (a) providing PP13-responding cells having a membrane; (b) exposing the cells to standard PP13; (c) exposing PP13-responding cells to PP13 obtained from the woman, and (d) determining the existence of a modification in the permeability of the cell membrane in (b) and in (c) as a result of exposure to PP13. The modification in permeability in (b) and (c) is then compared, a change in the permeability of (c) as compared to the permeability in (b) indicating the existence of a pregnancy complication in the woman.