Gastrointestinal Involvement

This prospective observational study aims to evaluate plasma intestinal fatty acid-binding protein (I-FABP) levels in children with IgA vasculitis and investigate their association with gastrointestinal involvement. Blood samples will be collected at diagnosis and during follow-up 2-4 weeks later. The study will assess the potential value of plasma I-FABP as a biomarker for gastrointestinal involvement in pediatric IgA vasculitis.