CRP and appendicitis: Among children who received a diagnosis of appendicitis, all of those with concomitant MIS-C had an increased level of C-reactive protein compared with 74% of children without MIS-C (mean [SD], 16.8 [12.0] vs 4.8 [4.10] mg/dL; P = 0.008), although the levels of leukocytes, lymphocytes, and ferritin were similar.