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Obtaining viable sperm from frozen-thawed testicular tissue can be variable. Sometimes you can get viable sperm, sometimes not. If frozen-thawed testicular sperm are to be used, I agree that you should consider purchasing donor sperm for back up. If using donor sperm as a backup is not acceptable, I would suggest you schedule the IVF procedure when your husband can be present and provide fresh testicular tissue.
If it is possible to obtain epididymal sperm (MESA), then having donor sperm as a backup is not as necessary (although still a good idea). Because epididymal sperm are considerable more mature than testicular sperm, their post-thaw survival is higher.
For more information about TESA/TESE and MESA, see:
http://www.sbivf.com/
male_surgeries.htm
You
are correct that donor sperm is also frozen, but the survival rate is much higher because these fully mature sperm were ejaculated prior to freezing.
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