The most notable initial laboratory abnormalities were elevated erythrocyte sedimentation rate (ESR) (n = 530) (91.07%, (95% CI 88.54–93.21%)), increased CRP (n = 413) (70.96%, (95% CI 67.24–74.61%)), lymphopenia (n = 369) (63.40%, (95% CI 59.32–67.41%)), and high serum ferritin (n = 315) (54.12%, (95% CI 50.04–58.38%)), followed by increased D-dimer levels (n = 281) (48.28%, (95% CI 44.57–52.81%)). Here, CRP is linked to lymphopenia.