Related Experiment Video
Updated: Jan 20, 2026
Irritable Bowel Syndrome I: Introduction
Is fecal calprotectin always normal in children with irritable bowel syndrome?
1Department of Pediatrics, Inje University Ilsan Paik Hospital, Goyang, Korea.
Insights
Fecal calprotectin (FC) levels are higher in children with irritable bowel syndrome (IBS) compared to healthy controls. These levels vary significantly among IBS subtypes, suggesting low-grade bowel inflammation in pediatric IBS.
Area of Science:
- Pediatric Gastroenterology
- Inflammatory Bowel Disease Research
- Gastrointestinal Health
Background:
- Fecal calprotectin (FC) is a recognized biomarker for intestinal inflammation.
- Irritable bowel syndrome (IBS) pathophysiology may involve intraluminal intestinal inflammation.
- Evaluating FC levels in pediatric IBS is crucial for understanding disease mechanisms.
Purpose of the Study:
- To assess fecal calprotectin (FC) levels in children diagnosed with irritable bowel syndrome (IBS).
- To compare FC levels between children with IBS and healthy controls (HCs).
- To investigate differences in FC levels across various pediatric IBS subtypes.
Main Methods:
- Prospective study including 157 children with IBS and 56 HCs (ages 4-16).
- IBS diagnosis based on Rome III criteria, with subtypes: IBS with constipation (IBS-C), IBS with diarrhea (IBS-D), IBS with alternating constipation and diarrhea (IBS-M), and IBS unsubtyped (IBS-U).
- Fecal calprotectin (FC) concentration measured via enzyme-linked immunosorbent assay (ELISA).
Main Results:
- Children with IBS exhibited significantly elevated FC levels (88.71 μg/g) compared to HCs (17.77 μg/g).
- FC concentrations varied significantly among IBS subtypes: highest in IBS-D (169.94 μg/g), followed by IBS-M (45.04 μg/g), IBS-C (31.22 μg/g), and IBS-U (33.52 μg/g).
- Postinfectious IBS (PI-IBS) cases were predominantly categorized within the IBS-D group (90%).
Conclusions:
- Pediatric IBS is associated with significantly higher fecal calprotectin (FC) levels than in healthy children.
- FC levels differ notably across IBS subtypes, reinforcing the concept of low-grade bowel inflammation in IBS.
- Findings support FC as a valuable marker for assessing inflammation in pediatric IBS.
Background/Aims:
Fecal calprotectin (FC) is a marker of intraluminal intestinal inflammation. Intestinal inflammation may contribute to the pathophysiology of irritable bowel syndrome (IBS). This study evaluated FC levels in children with IBS and differences in FC levels in children stratified by IBS subtype and healthy controls (HCs).
Methods:
A total of 157 children with IBS and 56 HCs aged 4-16 years (119 boys, 94 girls, mean age of 9.48 years) were included in this prospective study. Children with IBS were diagnosed using the Rome III criteria and classified into 4 subtypes: IBS with constipation (IBS-C, n=37), IBS with diarrhea (IBS-D, n=54), IBS with alternating constipation and diarrhea (IBS-M, n=49), and IBS unsubtyped (IBS-U, n=17); postinfectious IBS (PI-IBS) was also considered. The FC concentration in stool samples was analyzed using an enzyme-linked immunosorbent assay. All participants answered a questionnaire regarding several demographic and clinical characteristics.
Results:
Children with IBS had significantly higher levels of FC than the HCs (88.71 μg/g vs. 17.77 μg/g). Among the 4 IBS subtypes, the FC concentration was highest in children with IBS-D, followed by those with IBS-M, IBS-C, and IBS-U (169.94 μg/g vs. 45.04, 31.22, and 33.52 μg/g, respectively), and these differences were statistically significant. For PI-IBS, 90% of cases were in the IBS-D group.
Conclusions:
The FC level was significantly higher in children with IBS than in HCs and differed depending on the IBS subtype, supporting the notion that IBS is a type of low-grade bowel inflammation.
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