PIP: Urinary pregnandiol and estriol levels were estimated by gas-liquid chromatography during abortion in 14 second-trimester pregnant women induced by 5-12.5 mg Trichosanthin. The plant protein was injected intramuscularly in 12 women and intraamniotically in 2. In all the cases studied, urinary hormone excretion increased temporarily after the administration of the drug; then decreased gradually to an extremely low level before and after parturition. The relationship between the changes of urinary hormone levels and the effects of Trichosanthin upon placental function are discussed. (Authors' modified)