I-FABP as a Predictor of Gastrointestinal Involvement in Pediatric IgA Vasculitis (IFABP-IgAV)

This prospective observational cohort study aims to evaluate the association between plasma intestinal fatty acid-binding protein (I-FABP) levels and gastrointestinal involvement in children with IgA vasculitis (Henoch-Schönlein purpura).

Children aged 2-18 years who fulfill the EULAR/PRINTO/PRES classification criteria for IgA vasculitis will be enrolled. Clinical, laboratory, and demographic data will be collected at diagnosis (baseline). Participants will be followed prospectively, and a second assessment will be performed during the routine follow-up visit at approximately 2-4 weeks after diagnosis.

Blood samples will be obtained at baseline and during follow-up. Plasma will be separated and stored for subsequent measurement of I-FABP levels. The primary objective is to determine whether plasma I-FABP levels are associated with the presence of gastrointestinal involvement in pediatric IgA vasculitis.

Participants will be classified according to the presence or absence of gastrointestinal involvement. Clinical manifestations, laboratory findings, and plasma I-FABP levels will be compared between groups. The study does not involve administration of investigational drugs, devices, or therapeutic interventions. All procedures are performed as part of routine clinical follow-up with additional blood sampling for biomarker analysis.

The findings may help identify noninvasive biomarkers for the early detection and assessment of gastrointestinal involvement in children with IgA vasculitis.