We can perform an analysis so long as you can produce some semen. The analysis will tell you if your sample has a very low sperm count or no sperm present.
If there are no sperm present in your sample, your results will not be viable for freezing. But even if you have a very low sperm count, your sample is viable for freezing, and freezing may be especially important for those who have poor semen parameters.
For use in IUI, you need a post-thaw total motile sperm count of around 8–10 million. For use in IVF, there is no minimum amount of sperm. The latest techniques used in IVF — called ICSI — only need a single sperm to inject directly into the egg, so a sample with any motile sperm can be used multiple times.