Su1922 – Performance of a Novel Fecal Calprotectin Assay for Differentiation of Inflammatory Bowel Disease from Irritable Bowel Syndrome

The gastrointestinal pathologies have increased over the last years. The clinical pictures of inflammatory and irritable bowel disease might overlap, leading to expensive and invasive tests. Our study aims to investigate fecal calprotectin as an effective tool for differential diagnosis of gastrointestinal disorders. Two hundred fifty-six patients with the diagnosis of the gastrointestinal disorder and subjected to colonoscopy were collected for the statistical analysis of fecal calprotectin. The differential diagnosis of intestinal inflammation or non-inflammation was performed according to the Receiver Operating Characteristic (ROC) curve that outlines the Area Under Curve (AUC), Sensitivity (Se), Specificity (Sp). Fecal calprotectin was significantly elevated in patients with inflammatory bowel disease compared with patients with irritable bowel syndrome. Especially, the mean values of fecal calprotectin were 522 g/g (IQR=215-975) and 21 g/g (IQR=14-34.5) in patients with and without inflammation, respectively (P<0.0001). AUC value of fecal calprotectin was 0.958 (Se=88.9%, Sp=91.1%, with a cut-off value of 50 g/g) for differentiating between inflammatory bowel disease and irritable bowel syndrome. Fecal calprotectin seems to be a non-invasive and inexpensive biomarker useful for the purpose of a differential diagnosis between inflammatory bowel disease and irritable bowel syndrome.

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Analytical Performance and Clinicopathologic Correlation of Four Fecal Calprotectin Methods

American Journal of Clinical Pathology ◽

10.1093/ajcp/aqz051 ◽

2019 ◽

Vol 152 (3) ◽

pp. 392-398

Author(s):

Leonie P J Pelkmans ◽

Monique J M de Groot ◽

Joyce Curvers

Keyword(s):

Inflammatory Bowel Disease ◽

Irritable Bowel Syndrome ◽

Bowel Disease ◽

Fecal Calprotectin ◽

Analytical Performance ◽

Clinicopathologic Correlation ◽

Patient Category ◽

Noninvasive Biomarker ◽

Inflammatory Bowel ◽

Irritable Bowel

Abstract Objectives Calprotectin is a noninvasive biomarker that can distinguish inflammatory bowel disease from irritable bowel syndrome. We investigated four automated fecal calprotectin methods on five different platforms for their preanalytical process, analytical performance, and clinicopathologic correlation. Methods Four calprotectin methods (Bühlmann, EliA CN, EliA CN2, and DiaSorin) were performed on five platforms (Cobas 8000 E502, Phadia Immunocap 100 and 250, and Liaison and Liaison XL) in two hospital laboratories. Results Overall variation for the different extraction devices was less than 19% when feces were of normal consistency. Freeze-thawing of samples resulted in comparable results compared with fresh samples. The different methods had a good analytic correlation (R = 0.83-0.95). Their clinicopathologic correlation was comparable, but the Bühlmann method showed significantly higher calprotectin values in every patient category. Conclusions The automated calprotectin methods showed a good performance and comparable clinicopathologic correlation. Due to lack of standardization, the numerical values differ for the various methods.

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