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Pregnancy RatesPregnancy rates with ET range from 40-70%. There is no difference between surgical and non-surgical procedures and progesterone supplementation does not improve the rate. There is significant variation in the rates by different technicians. It is possible to cool embryos to 5°C and store them for 12 - 24 hours. The procedure is to cool and store embryos in Hams F10 + 10% Fetal Calf Serum. Cooling and storage can be done in an Equitainer. Freezing of embryos is possible but requires recovery of a day 3 -5 embryo which can not be collected by non-surgical techniques. This procedure has not been used outside of the research laboratory. |
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