It is generally assumed that, so long as viable placental tissue remains in contact with the maternal circulation, the excretion of gonadotropic substance in the urine continues, irrespective of death or delivery of the fetus. Ware and Main1 reported that, following delivery of a near term abdominal pregnancy with retained placenta, gonadotropic substance continued to be excreted in amounts sufficient to produce ovulation tests on rabbits for thirty-six days. Goldberger and his associates2 found that the ovulation test remained positive on the rabbit as long as thirty days after death of the fetus.
Eisaman and Ziegler3 state that in a case of abdominal pregnancy with retained placenta they were able to obtain positive ovulation tests on rabbits for only eight days after delivery. An infection occurred two weeks after the operation.
In order to determine whether the long duration of excretion of gonadotropic substance reported by Ware
Ware HH, Main RJ, Taliaferro I. THE DURATION OF EXCRETION OF GONADOTROPIC SUBSTANCE AFTER DELIVERY OF NEAR TERM ABDOMINAL PREGNANCY WITH RETAINED PLACENTA. JAMA. 1938;111(6):524. doi:10.1001/jama.1938.72790320004011c
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