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From the Institute of Obstetrics and Gynecology, Chelsea Hospital for Women, London, SW3.
Plasma progesterone, 17-hydroxyprogesterone, estrone, estradiol, and estriol were determined before and serially after the intraamniotic injection of prostaglandin F2A (75 mg) for induction of midtrimester abortion. A general decline in hormone concentrations preceded the mean time to abortion by several hours. The decreases in plasma progesterone and estriol were significant 3 hours after the injection procedure, indicating a definite effect on the fetoplacental unit.
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