According to this curve, the accuracy and respective confidence intervals (CI) of the biomarkers for the diagnosis of inflammatory activity in patients with Crohn’s disease were 0.77 for faecal calprotectin (95% CI: 0.65–0.88; p < 0.001), 0.75 for CRP (95% CI: 0.64–0.86; p < 0.001), 0.64 for the platelet count (95% CI: 0.51–0.77; p = 0.041) and 0.55 for haemoglobin levels (95% CI, 0.42–0.69; p = 0.438). The gene discussed is CRP; the disease is Crohn disease.