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Ovarian hyper stimulation syndrome is over response of your body to fertility
inducing drugs. It is characterized by increase in size of your ovaries, fluid and electrolyte imbalance
which may affect your body adversely. So whenever there is risk of moderate to severe OHSS embryo transfer is not done in same cycle and embryos are frozen to do frozen embryo transfer
( FET) in later date when your body recovers from OHSS. FET success rates are equally good. OHSS does not increase chance of having abnormal or dead baby but increases risk to your own body.