Year 2015 / Volume 107 / Number 4
Original
Fecal calprotectin as a biomarker of inflammatory lesions of the small bowel seen by videocapsule endoscopy

211-215

Juan Egea-Valenzuela, Fernando Alberca-de-las-Parras and Fernando Carballo-Álvarez

Abstract
Introduction: The levels of calprotectin in the stools are proportional to neutrophil activity in the enteric lumen, so fecal calprotectin is a useful intestinal inflammatory biomarker. It is an extended tool as predictor of colonic pathology but there is scare evidence about its utility in the small bowel.
Objective: To test the yield of fecal calprotectin to detect lesions in the small bowel.
Material and methods: We have retrospectively included 71 patients sent for small bowel capsule endoscopy in study for suspected inflammatory bowel disease. All of them had a determination of fecal calprotectin and had been sent to colonoscopy with no findings. Patients have been divided in groups: A, fecal calprotectin < 50 µg/g; B, fecal calprotectin: 50-100 µg/g; C, fecal calprotectin > 100 µg/g, and we have analyzed which of them presented inflammatory lesions in capsule endoscopy studies.
Results: The rate of patients with signi ficative lesions was 1 out of 10 (10%) in group A, 6 out of 24 (25%) in group B, and 21 out of 34 (62%) in group C. If we consider levels over 50 µg/g pathologic, fecal calprotectin presents sensitivity: 96%, specificity: 23%, NPV: 90% and PPV: 56%. If we consider levels over 100 µg/g pathologic these values are sensitivity: 75%, specificity: 67%, NPV: 79% and PPV: 62%.
Conclusions: Fecal calprotectin has high sensitivity but not so good specificity for predicting small bowel lesions after a normal colonoscopy. In daily practice it will be more useful to establish in 100 µg/g the limit to indicate capsule endoscopy studies.
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Juan Egea-Valenzuela, Fernando Alberca-de-las-Parras and Fernando Carballo-Álvarez. Fecal calprotectin as a biomarker of inflammatory lesions of the small bowel seen by videocapsule endoscopy. 211-215


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