Elevated fecal calprotectin is linked to psychosocial complexity in pediatric functional abdominal pain disorders.

Fifty-six children with FAPD (Mage = 12.23) completed measures of anxiety (Screen for Child Anxiety Related Disorders), disability (Functional Disability Inventory), and pain intensity (Numeric Rating Scale). Participants were stratified into risk groups (range: 0-3). Fisher's exact tests were conducted to determine if children with three versus fewer risk factors were more likely to have elevated FC (≥ 50 µg/g) versus normal levels. Children with three risk factors (MFC = 86.04) were more likely to have elevated FC compared to children with zero (MFC = 25.78), one (MFC = 38.59), and two risk factors (MFC = 45.06; p's < 0.05). Those with three risk factors had borderline elevated FC concentrations whereas those with fewer had normal FC concentrations. Findings suggest the importance of a biopsychosocial approach to help elucidate a FAPD phenotype.