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Cheers. Sorry for the delay luv - I've been sick.
Tough call. You can't tell anything about the developmental potential of 4-cell embryos, which is a major limitation if you can only transfer 2. On the other hand, if the lab has limited experience with blastocyst culture, I would not suggest being a guinea pig for their learning curve. Gowing blastocysts is not rocket science, but the lab conditions have to be kicked up a notch from culturing embryos to Day 2. Go with what they know and hope for the best. However, I think there is something really wierd going on here. At 27 with good fert and good embryos (and a new partner), I'm suspicious of implantation issues. Did your immune testing include Natural Killer Cell (accompanied by the "dum, dum" music from "Jaws") levels and activation? These test are important to determine if your immune system is being a little over zealous in patrolling your uterine cavity. I'd recommend it if it hasn't been done.
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