The presence of the protein Lactoferrin, produced by white blood cells (WBCs), in the stool is an indirect measurement of increased levels of WBCs due to infection or inflammation in the intestines. High lactoferrin levels are seen in people with inflammatory diseases ulcerative colitis or Crohn's disease; low lactoferrin levels are seen in people with noninflammatory irritable bowel syndrome (IBS). High lactoferrin levels are also seen in people with diarrhea caused by bacteria, but levels will not increase in diarrhea caused by parasites or viral disease.
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