Understanding Low Faecal Calprotectin: Causes and Next Steps

Faecal calprotectin is a protein found in your stool that helps doctors assess intestinal inflammation. It is often used to differentiate between inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS). While much emphasis is placed on elevated levels of faecal calprotectin, it's also important to understand what low levels mean and why they might occur.

What is faecal calprotectin?

Faecal calprotectin is a protein released by white blood cells when there is inflammation in the intestines. It is measured through a stool test and serves as a marker for intestinal inflammation. This test is particularly useful in distinguishing between inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis, and non-inflammatory conditions like irritable bowel syndrome.

What does a low faecal calprotectin level mean?

A low faecal calprotectin level generally indicates that there is little to no inflammation in the intestines. According to clinical guidelines, levels below 50 µg/g are considered normal, although this can vary depending on the specific assay used. Low levels are usually not a cause for concern and often suggest that inflammatory bowel disease is unlikely.

Causes of low faecal calprotectin

• Effective treatment: If you have been undergoing treatment for an inflammatory bowel condition, a low faecal calprotectin level may indicate that the treatment is working and inflammation has been reduced.
• Non-inflammatory conditions: Conditions like irritable bowel syndrome, which do not cause intestinal inflammation, usually result in low faecal calprotectin levels.
• Testing variability: Different assays and laboratory techniques can yield varying results, so a low reading might simply reflect the specific testing method used.

Symptoms associated with low faecal calprotectin

Low faecal calprotectin levels themselves do not cause symptoms. However, they are often found in individuals who do not have active intestinal inflammation. If you are experiencing digestive symptoms such as abdominal pain, bloating, or irregular bowel movements, but have a low faecal calprotectin level, it may suggest a non-inflammatory condition like IBS.

Frequently asked questions

What is a normal range for faecal calprotectin?

The normal range for faecal calprotectin is generally considered to be below 50 µg/g, but this can vary depending on the assay used.

Can I have low faecal calprotectin and still have digestive symptoms?

Yes, low faecal calprotectin levels can occur in conditions like irritable bowel syndrome, which can cause digestive symptoms but do not involve inflammation.

Does a low faecal calprotectin level mean I am healthy?

A low level generally indicates a lack of intestinal inflammation, but it does not necessarily mean you are free of all digestive issues.

When to see a doctor

If you have a low faecal calprotectin level but are experiencing significant digestive symptoms, it's a good idea to consult a healthcare provider. They can help determine whether your symptoms might be due to a non-inflammatory condition like IBS or another underlying issue.

Remember, this information is meant to provide a general understanding and should not replace professional medical advice. Always discuss your test results with your healthcare provider.