IBS is diagnosed based on patient reported symptoms and stool patterns. According to guidelines these criteria, patients with IBS patients will have the following symptoms:
- Must Have
- Abdominal discomfort at least 3 days per month in the last 3 months
- Along with some or all of these
- change in either frequency or form of stool
- abdominal discomfort that improves after going to that bathroom
- passage of mucous in stool
The following tests are used to confirm or rule out diagnosis
- Hydrogen breath test (HBT), is a non-invasive test used to for small intestinal bacterial overgrowth called H.pylori. H.pylori is often thought to be related to IBS symptoms.
- Stool analysis, is a non- invasive test to rule out bleeding, parasites, etc
- Blood tests, invasive test where needle is inserted into the vein and blood sample is removed.
- WBC (abnormal WBC would indicate possible infection)
- Sed rate ( abnormal would indicate possible inflammation).
- Most of the time IBS will not test positive for these two.
- Colonoscopy, is an invasive test where they insert a small camera into the anus and view the lower intestines.