Stool tests looking for any source of infection should be considered. This can include a stool culture, ova and parasites as well as tests for
giardiaGiardiasis.
If the diarrhea is chronic, then an endoscopy would be the next step - either a
colonoscopy or flexible
sigmoidoscopy. This can evaluate for signs of
inflammatoryInflammatory bowel disease
Ulcerative colitis bowel disease or colitis.
If the tests remain non-revealing, you can opt for more specialized testing like blood tests for celiac disease or stool tests looking for various malabsorption syndrome.
Irritable bowel disease can also be considered - but other diseases should be ruled out first.
You can discuss these options with your personal physician, or in conjunction with a GI evaluation.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com