There was a difference in the number of white blood cells (< 0.001), platelets (0.016), D-dimer (< 0.001), ferritin (0.011), CRP (0.006), blood glucose (0.038) in the severity group compared with mild-severe grouThreshold leukocyte ≥ 11.6 k / μl, platelets 191 k / μl, D-dimer ≥ 1164 ng / ml, ferritin ≥ 370.73 ng / ml, CRP ≥ 26 mg / l, blood glucose > 7.47 mmol / l for predictor of severity in COVID-19 patients.