There were numerous differences in postoperative laboratory findings between COVID-19 and control patients (Table 2), including lower lymphocyte (mean [SD] 0.66 [0.27] × 109/L vs. 0.75 [0.29] × 109/L, p = 0.048), higher C-reactive protein (median [IQR] 94 [50–137.5] mg/L vs. 70.5 [21.7–136.2] mg/L, p = 0.013) and higher D-dimer (median [IQR] 4.42 [3.22–8.45] mg/L vs. 3.6 [1.91–5.41] mg/L, p = 0.003). This evidence concerns the gene CRP and COVID-19.