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Radiation exposure during first trimester: When is abortion indicated?


 This question was answered by 2 consultants. On the 1st day of gestation an increased risk of embryonic death may be produced by 10 rads of radiation exposure, while later in the first trimester 25 rads should be unlikely to have any grossly deforming effect on the embyro. An expsure that occurs over a few minutes may have a different effect on the embryo than exposures accumulated over several days. Since most diagnostic radiation does not approach 10 rads, therapeutic abortion is not indicated. Studies on experimental animals have given no indication of an increased incidence of malformations or growth defects with doses expected in diagnostic studies. Therapeutic radiation may deliver dose of 25 rads or more and changes have been produced in experimental animals. Therefore, abortion would be recommended after such exposure.
