Calprotectin level 1800 but colonoscopy was fine?!

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I’m 50yrs old and recently saw my GP  because of ongoing bowel issues - constipation, mucus in bowel movements etc. He got me to do a stool sample and my Calprotectin level came back very high at over 1800! Normal is under 50.  Dr then sent me for a colonoscopy that showed nothing wrong except Diverticulosis.   I know a reading that high is usually indicative of IBD but colonoscopy didn’t show anything sinister. I feel fine at the mo.  I’m just so confused why the stool sample showed that very high level.  What could have caused that to happen?  GP is now away for 2 weeks.  So i’m unable to discuss it with him. Has anyone else had such a high reading and everything has been ok?  I know it’s not normal.

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    Hi Alison I had a calprotectin of over 6000.  I too had a colonoscopy which showed inflammation but no evidence of crohns disease.  It could be an infection which is what they think I had.  I would probably have it retested but make sure you have symptoms when you do to get an accurate result.  I think with crohns its not just the calprotectin test they go by but also your symptoms.  Many people think calprotectin Alone is suggestive of crohns but there's many reasons for a high result.  Many doctors go by the symptoms and not the result.  

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