(USA) Respirator Fit Tests

I have some employees who need a respirator fit test. The last certifications were done in house by our old manager, who no longer works here. Our local hospital didn't have an option to do one (waiting to hear back from urgent care).

There's lots of ads when I Google this question so wanted a recommendation. I forsee a few options:

1. The Urgent Care can do them (All set!)

2. I get trained in how to do them myself (I would appreciate recommendations for who to go to.)

3. Third party comes in and does them (Would also appreciate a recommendation if anyone has one.)

Thanks all!