Faecal calprotectin
What this test measures
Calprotectin is a protein released by white blood cells. Measuring it in a stool sample shows whether there is inflammation in the lining of the bowel.
Why doctors request it
UK GPs use it to help tell irritable bowel syndrome, which does not raise it, from inflammatory bowel disease, which does.
What commonly pushes it up
- Inflammatory bowel disease (Crohn's and ulcerative colitis)
- Gut infections
- Anti-inflammatory painkillers as a class
- Bowel polyps and some cancers
- Coeliac disease, sometimes
What commonly pushes it down
- Treatment of the inflammation
Everyday reasons for a value outside the range
- Anti-inflammatory painkillers raise it
- Values between 50 and 150 are often repeated rather than acted on
- Ranges are different in young children
About the sample
A small stool sample in the lab pot, refrigerated if not delivered the same day.
Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.
Read my report freeThis is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.