Blood tests to look at hormone levels
HSG (they run dye through your tubes to look if they are blocked)
laparoscopy (to see endometriosis, cysts, fibroids)
If are you are falling but miscarrying a lot they can look at killer NK cells and certain genes that stop the processing of folic acid etc.
When your DH goes for another test, ask that motility be broken into progressive and non progressive (non progressive are technically alive but just spin around and will never get to the egg). So he might have a motility level of 25-30% (which is bottom end of normal) but his progressive motility, the ones that swim for the egg might be only 5-10%. Dh's was 6