Blood tests for colitis and Crohn's disease are a relatively new and exciting development that have added significantly to the screening, diagnosis and management of ulcerative colitis and Crohn's disease. Differentiating the two may allow better predictions regarding responses to medical treatments, decisions regarding surgery options and the risks of various complications. Antibodies to various proteins including Baker's or Brewer's yeast (saccharomyces cerevisiae) and bacteria like Escherichia. coli (E. coli) are present in the blood of many people with Crohn's disease but rarely in normal people. Antibodies to a normal cell component, a nuclear protein, is present in most people with ulcerative colitis, a few people with Crohn's whose colitis behaves more like ulcerative colitis than Crohn's, and rarely in normal people.
It affects the superficial lining of the colon and rarely causes bowel obstruction (blockage) or perforation (rupture) but frequently causes severe bloody diarrhea, blood in the stool, weight loss, abdominal pain, as well as joint aches or arthritis, skin rashes, eye irritation and occasionally a severe liver disorder known as primary sclerosing cholangitis that can lead to cirrhosis and liver cancer. Ulcerative colitis can be cured by complete removal of the colon but not Crohn's disease.
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