**4. Embryo cryopreservation and ART**

All of the advances that had been made in the last two decades regarding embryo cryopreservation would be of no significance if the success rates after FET were minimal. So what is the place of embryo cryopreservation among other basic ART methods? What are the positives and negatives of having embryos frozen/thawed and transferred instead of having a fresh transfer? We will try to give answers to these very important questions.
