Question 1

How accurate is the calprotectin test for detecting IBD?

Accepted Answer

Studies show that calprotectin testing has a sensitivity and specificity of 89% and 81% respectively in discriminating IBD from non-IBD diagnoses at a cutoff of 50 μg/g, and improves to 98% sensitivity and 91% specificity at 100 μg/g. While highly accurate, the test is not diagnostic by itself and may require additional testing for confirmation. False negatives can occasionally occur, particularly in children or patients with limited disease affecting small areas of the intestine.

Question 2

Can medications affect calprotectin test results?

Accepted Answer

Yes, certain medications can influence calprotectin levels. NSAIDs, aspirin, and proton pump inhibitors may cause borderline elevations in fecal calprotectin. Some patients taking NSAIDs will have elevations in their fecal calprotectin levels. It's important to inform your healthcare provider about all medications you're taking when interpreting results, as they may recommend repeat testing after medication adjustments.

Question 3

How long does the stool sample remain stable for testing?

Accepted Answer

Calprotectin is remarkably stable in stool samples and can remain stable at room temperature for at least 7 days, allowing samples to be collected at home and sent by standard mail to the laboratory. When frozen, the protein remains stable for long-term storage. This stability makes the test convenient for home collection and reduces the need for immediate laboratory processing.

Question 4

What conditions besides IBD can cause elevated calprotectin?

Accepted Answer

Other intestinal conditions including gastrointestinal infections and colorectal cancer can result in elevated calprotectin concentrations. Food poisoning can cause very high levels, though it usually resolves quickly. Elevated calprotectin may also be observed in celiac disease and other conditions associated with neutrophilic inflammation of the gastrointestinal system. This is why additional testing may be needed to determine the specific cause of inflammation.

Question 5

Can the test predict IBD flare-ups in diagnosed patients?

Accepted Answer

Research shows that calprotectin can predict imminent clinical relapse with an 80% sensitivity and accuracy in patients with established, relatively asymptomatic IBD, whether ulcerative colitis or Crohn's disease. If you're already being treated for inflammatory bowel disease and feel like symptoms are starting to return, this test may help predict a flare-up. Regular monitoring can help guide treatment decisions and potentially prevent severe flare-ups when levels begin to rise.

Calprotectin (Stool)