Borderline Calprotectin Result: What Does It Mean?

A laboratory may use ‘borderline elevated’ for an intermediate result between its non-elevated and clearly elevated categories. For fecal calprotectin, also written faecal calprotectin, those boundaries depend on the laboratory and test method.

This guide concerns adults reviewing an existing result. Calprotectin helps assess intestinal inflammation, but the label is not a diagnosis. A low or borderline label does not, by itself, settle the explanation for continuing symptoms.

Calprotectin is released by certain white blood cells involved in inflammation. An increased stool level can reflect inflammation in the intestines, but it does not identify its location or cause. Infection can also raise it. The test is not specific to inflammatory bowel disease, or IBD.

Ask what the result contributes alongside your symptoms, examination and other findings. It is one piece of evidence, rather than a label that explains every digestive symptom.

Read the reference values and comment supplied with your result. Another laboratory may use different categories, so an online number is not a personal diagnostic threshold.

A calprotectin test and a test for blood in stool measure different things; their results are not interchangeable.

Ask: ‘How does the report's category fit the reason I was tested, and what remains uncertain?’

Tell the clinician about recent diarrheal illness and medicines you use. Infection and some medicines, including anti-inflammatory painkillers, can affect the inflammatory picture. Their presence does not prove why your result changed. Explain when the illness happened and which products you actually used, while leaving the cause for clinical assessment.

Do not stop prescribed medicines to change the number. Ask your team for instructions for the requested test.

During investigation of symptoms, calprotectin helps the clinician assess the possibility of intestinal inflammation. In established Crohn's disease or ulcerative colitis, it may instead help monitor disease activity or response to treatment. A monitoring target discussed by someone with diagnosed IBD is not automatically the right interpretation for a new diagnostic question.

Ask: ‘Was this investigating symptoms or monitoring a known condition, and what remains uncertain?’ Confirm who will explain the next step. The linked guides can help with appointment questions and describing symptoms.

Get urgent medical advice for bloody diarrhea or vomiting that prevents you keeping fluids down. Sudden severe abdominal pain, severe breathing difficulty, confusion or reduced responsiveness need emergency care through local services. Follow any urgent plan you were given rather than waiting for another calprotectin result.