Lisa, I remember going into my 2nd FET thinking "it's ok, there's three embryos, we've still got another two goes if this one doesn't work". It didn't work... But we lost two embryos in thawing, so going back in for what should have been my second embryo, was going in for my last.

For me, the OHSS on both fresh cycles has been so bad that fresh transfers just haven't been possible. Nothing I can do about thaw rates but sit and hope. I've had a similar thread going, asking the same things - 2/3 failing to survive is much higher than the averages I've been given.

The biggest problem is that for each couple, thaw rates will vary significantly. One couple may get 100%, another 50%, another might be lucky to get 25% thaw successfully. It also varies from cycle to cycle for each couple, too.

Sadly, the only way to tell if an embryo is going to thaw or not, is to actually thaw it and see. Averages mean bugger all to that individual embryo, though. It's a bit like tossing a coin - you have an even chance of getting heads or tails. You can toss that coin 5 times in a row and get tails every time - the next toss, you're still just as likely to get heads as tails as you were on all the others. You can calculate the probabilities all you like, but it really won't change how things are going to turn out.

Sorry if I've rambled, I do want you to know that you most definitely are NOT the only one that's ever wondered about this!

BW