CRP and Crohn disease: Further, the global FAPI-PET/CT score (defined as the sum of TBR in the affected segments, divided by the number of studied intestinal segments213) correlated with biomarkers such as C-reactive protein (CRP) or clinical indices for disease severity such as Crohn’s disease activity index (CDAI) or Crohn’s disease endoscopy index of severity (CDEIS).