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Just after some information as to whether Crohn's Disease (CD) or Ulcerative Colitis (UC) can be seen during a routine blood test?
I've done a bit of research and found that routine blood tests cannot diagnose CD or UC, but are good indicators on how severe the levels of inflammation / infection are during active flare ups, and whether medications are helping to subdue the diseases.
I only ask as I was recently asked to provide a stool sample to test for faecal calprotectin, which came back positive. This is the third test I had done in the last year and the results have always been around 350. I had a follow up colonoscopy about 6 months ago, as a result of the first positive calprotectin result, however everything looked healthy and the biopsies came back fine, ruling out UC. Now my doctor suspects CD, however I had a blood test taken a few days after the faecal calprotectin test and the results of the blood test was fine, apart from slightly low vitamin D levels. This recent blood test according to the nurse was the full works, and I know included vitamin B12 and D tests, magnesium levels, liver function, kidney function, and a load more including the routine tests. I've been having digestive problems for about three years now, and had numerous blood tests in that time and the only problem ever found was slightly low vitamin D results, no other problems ever found.
I'd be very grateful for any thoughts and views on this query, especially if you know whether or not active CD or UC are in fact visible on blood tests.
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