OP - are you using a local donor or a US Xytex donor? I can't remember... I was told that only the donors with the highest mobile sperm count (pre- and post-thawing) are used in the first place at Xytex, so it's just a matter of defrosting the vial... I haven't really asked for more info than that to be honest.



I think in a clinical environment it's mainly to a) screen for disease and b) improve the odds for fertilisation/eliminate negative influencing factors.






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