My doctor had me do an ERMI test through Mycometrics lab. Cost is $300 total. The ERMI is what Shoemaker and the docs who use the Shoemaker protocol use. I've done 4 ERMI tests on 4 buildings now. Compared to air sample testing, ERMI is far superior to understanding what you're being exposed to and the resultant health effects. If you're thinking about testing for mold and have the money, I would go straight for the ERMI through Mycometrics. I've heard other labs have not been reliable. You will need to call the lab when you get the results and ask for guidance interpreting the values. It would be very helpful if they supplied a reference range, but they don't.
If you decide to do the ERMI, I can help you understand it.
I personally wouldn't consider the kits you buy at the store. I wouldn't want to do that and have false reassurance based on inadequate testing. Mold is serious business. If you're being exposed, you really need to know what you're dealing with IMO.