I use the GI-MAP gut test from Nordic Laboratories. A stool test, it is the "gold standard" of gut testing. The price includes shipping. You will need to book a nutrition consultation with test results once your results are returned from the lab.
 
This test includes the "add-on" of zonulin - the marker of intestinal permeability. Advisable with any long term gut condition, IBS, IBD, etc. Please book a discovery call to discuss if you are unsure.