Hi Diannie,The LEAP test (the MRT, as its actually called) is for those with IBS-D as well as IBS-C/D.I was more of a C/D with the D being predominant.The great thing about the test itself, is that you can go to the website, take the prescreening test and based on that, they can tell you if they think it will help you. That way you don't waste your money on a test that can't help you. My own parents wanted to take the test and Mom didn't fit the parameters of someone who could be helped, so they gave her some helpful hints on what the problem could be ( Mom's meds can make her tummy sensitive). Dad, on the other hand, did fit and he had his blood draw today.I have had such success with the dietary changes I made as per the results, its truly been amazing!It can be very difficult to track these food intolerances on your own. The reaction time can be up to 3 days later, and by then, you won't know which of the items consumed over that 3 day time period did her in- or if it was several.It sure can't hurt to take the prescreening test and see what they say.If you want more info, let me know- and you can read my "life story" in the Living with IBS section here.Best of luck and keep us posted,Lisa from Nevada