[In vitro study of comparative immunosuppressive activity of sera from pregnant women on an in vitro cellular cytotoxic reaction].

By means of an adaptation of a well-known in vitro cellular cytotoxic reaction we can demonstrate: 1. a strong immunosuppressive non-specific activity of sera from pregnant women; 2. a decrease or an absence of immunosuppressive activity of sera from pregnant women submitted to several spontaneous abortions; 3. we propose a reliable and simple test allowing us to predict the outcome of abortions.