The original method of electro-serodiagnosis of pregnancy. Kumagai (from Berich. ü. d. ges. Gyn., Bd. 14)

In the blood of pregnant women circulate specific substances (antigen), which form antibodies against placental proteins, and there is a marked change in the electric charge of the antigen. On this basis, the author advises to prepare an alcoholic extract of placenta, add it to the serum under study and pass an electric current through the mixture, observing then under a microscope the movement of particles to the anode. Without the addition of serum, this rate is 3.2 , per second, with the addition of normal serum it is 2.2 , and with pregnant serum it is 1.0 per second.