So I have been reading up on these different companies and their services for testing based on your suggestions. I am not totally clear on the first part about entering symptoms & signs and on OMIM...my son's symptoms are part of what is making this all so vague...Fatigue (this can be attributed to many underlying issues, brain fog..same thing...diarrhea (nearly lifelong) ...been tested up and down for all sorts, but nothing comes up. If I enter his symptoms and they are sort of "generic" as I listed above, I get quite a list of suggested issues. Any suggestions on how to approach this when it feels overwhelming? Should we just dive in and have him take a test and eel with it once it comes back with results? I sure appreciate your thoughts and ideas : )