Abstract
ABSTRACT Dilation of the uterine cervix for 16 hours as a preliminary to the induction of legal abortion during the first trimester of human pregnancy resulted in a marked increase in the plasma level of both progesterone and human chorionic gonadotrophin (HCG). In a control group (with the dilating instrument taped on the medial side of the upper thigh) no increase in progesterone occurred. The increase in the plasma level of HCG was more pronounced than that of progesterone, the mean increase being 80 and 50 per cent respectively. Following the termination of the pregnancy, the half life (t½) of endogenous HCG in peripheral plasma could be calculated, and was found to be about 7 hours.
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