Here are the required numbers that were emailed to me by a nurse at MS. She said that "normal motility" is 50% or greater.
For MicroSort IUI, 140 million TOTAL
sperm (assuming normal motility)
For MicroSort IVF/ICSI 70 million TOTAL sperm
(assuming normal motility)
If motility is below normal then reviewed on
a case by case basis.