I have read that performing blastocyst transfer gives better pregnancy rates. Why am I not having blastocyst transfer?
All that blastocyst transfer involves is observing the embryos for 2-3 days longer before deciding which are the best embryos to put back. The way in which it can increase pregnancy rates is by refining the embryo selection process. 123 When there are lots of good embryos to choose from on Day 3 of development it is not possible to tell which of these embryos have the best potential to implant and the decision on which embryos to transfer is better made at the blastocyst stage. However, if there are very few embryos that look good and the best embryos to transfer are obvious there are no benefits in waiting to the blastocyst stage and therefore the embryos are better put back in their natural environment at the cleavage stage.
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