Understanding Faecal Calprotectin: What Your Test Result Means

Faecal calprotectin is a marker used to assess inflammation in the intestines. Learn what your results mean and when to consult a doctor.

Full guide: Faecal calprotectin

Jul 15, 2026 2 min read

Faecal calprotectin is a marker measured through a stool test to assess inflammation in the intestines. It is particularly useful for distinguishing between inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS). Understanding your faecal calprotectin result can help you and your healthcare provider determine the next steps in managing your digestive health.

What is Faecal Calprotectin?

Faecal calprotectin is a protein found in white blood cells. When there is inflammation in the intestines, these cells release calprotectin into the stool. Measuring the level of faecal calprotectin helps doctors assess the presence of inflammation in the gastrointestinal tract. This test is non-invasive and provides valuable information about your intestinal health.

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Why Faecal Calprotectin Matters

Faecal calprotectin is an important marker for diagnosing and monitoring intestinal inflammation. It is particularly useful in distinguishing between IBD, which includes conditions like Crohn's disease and ulcerative colitis, and IBS, a functional disorder that does not cause inflammation. Elevated levels of faecal calprotectin suggest that inflammation is present, which may require further investigation or treatment.

Understanding Your Test Results

The results of a faecal calprotectin test are reported in micrograms per gram (µg/g). According to clinical guidelines, a level of less than 50 µg/g is generally considered normal, but this can vary depending on the assay used. An elevated level may indicate the presence of IBD or other inflammatory conditions.

Factors Affecting Faecal Calprotectin Levels

Various factors can influence faecal calprotectin levels, including age, recent infections, and the use of certain medications like non-steroidal anti-inflammatory drugs (NSAIDs). It's important to discuss these factors with your doctor to understand what might be affecting your results.

Frequently asked questions

What is considered a normal range for faecal calprotectin? A level of less than 50 µg/g is typically considered normal, but this can vary depending on the specific assay used.

Can faecal calprotectin distinguish between IBD and IBS? Yes, faecal calprotectin is useful in distinguishing between IBD, which causes inflammation, and IBS, which does not.

What should I do if my faecal calprotectin level is elevated? If your level is elevated, it is important to discuss the result with your doctor, who may recommend further testing or treatment.

When to see a doctor

If your faecal calprotectin test result is elevated or if you experience symptoms such as persistent abdominal pain, diarrhea, or unexplained weight loss, it is important to consult with your healthcare provider. They can help determine the cause of your symptoms and recommend appropriate treatment.

Decisions about your health should always be made in consultation with your healthcare provider.

Faecal calprotectin: more on this topic

Test page What it measures, normal range, what moves it

Conditions where this test is key

Often checked together

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