Value of fecal calprotectin in the evaluation of patients with abdominal discomfort: an observational study

Michael Manz, Emanuel Burri, Claude Rothen, Nuschin Tchanguizi, Christian Niederberger, Livio Rossi, Christoph Beglinger, Frank Serge Lehmann, Michael Manz, Emanuel Burri, Claude Rothen, Nuschin Tchanguizi, Christian Niederberger, Livio Rossi, Christoph Beglinger, Frank Serge Lehmann

Abstract

Background: The evaluation of patients with abdominal discomfort is challenging and patient selection for endoscopy based on symptoms is not reliable. We evaluated the diagnostic value of fecal calprotectin in patients with abdominal discomfort.

Methods: In an observational study, 575 consecutive patients with abdominal discomfort referred for endoscopy to the Department of Gastroenterology & Hepatology at the University Hospital Basel in Switzerland, were enrolled in the study. Calprotectin was measured in stool samples collected within 24 hours before the investigation using an enzyme-linked immunosorbent assay. The presence of a clinically significant finding in the gastrointestinal tract was the primary endpoint of the study. Final diagnoses were adjudicated blinded to calprotectin values.

Results: Median calprotectin levels were higher in patients with significant findings (N = 212, median 97 μg/g, IQR 43-185) than in patients without (N = 326, 10 μg/g, IQR 10-23, P < 0.001). The area under the receiver operating characteristics curve (AUC) to identify a significant finding was 0.877 (95% CI, 0.85-0.90). Using 50 μg/g as cut off yielded a sensitivity of 73% and a specificity of 93% with good positive and negative likelihood ratios (10.8 and 0.29, respectively). Fecal calprotectin was useful as a diagnostic parameter both for findings in the upper intestinal tract (AUC 0.730, 0.66-0.79) and for the colon (AUC 0.912, 0.88-0.94) with higher diagnostic precision for the latter (P < 0.001). In patients > 50 years, the diagnostic precision remained unchanged (AUC 0.889 vs. 0.832, P = 0.165).

Conclusion: In patients with abdominal discomfort, fecal calprotectin is a useful non-invasive marker to identify clinically significant findings of the gastrointestinal tract, irrespective of age.

© 2012 Manz et al; licensee BioMed Central Ltd.

Figures

Figure 1
Figure 1
Study flow. Study flow of patients referred for colonoscopy and esophagogastroduodenoscopy (EGD). A total of 37 patients were excluded from the final analysis, in 29 patients because follow-up endoscopy was not performed as required by the protocol (no clinically significant lesion on endoscopy but fecal calprotectin > 50 μg/g)
Figure 2
Figure 2
Receiver Operating Characteristics Curve. To identify clinically significant findings in the gastrointestinal tract, fecal calprotectin had an area under the receiver operating characteristics (ROC) curve of 0.877 (95% CI 0.85-0.90) (Figure 2A). The AUC of fecal calprotectin to identify clinically significant findings was better in the lower intestinal tract (AUC 0.912, 95%CI 0.88-0.94) (Figure 2C) than in the upper intestinal tract (AUC 0.730, 95%CI 0.66-0-79, P < 0.001) (Figure 2B).
Figure 3
Figure 3
Diagnostic accuracy of fecal calprotectin. The overall test accuracy of fecal calprotectin was 85% when 50 μg/g was used as cut off value (upper panel) and was 68% when 10 μg/g was used (lower panel).
Figure 4
Figure 4
Fecal calprotectin and severity of mucosal damage. Boxplots (median, 25th and 75th percentile) of fecal calprotectin values in patients with normal endoscopic findings (normal), gastric erosions (erosion), gastric ulcer (ulcer), and gastric cancer (carcinoma). * P < 0.001 against normal, # P = 0.002 against normal, § P = 0.157 against ulcer, † P = 0.027 against carcinoma, $ P = 0.088 against carcinoma.

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