CRP and COVID-19: Patients had significantly higher D-dimer, procalcitonin (PCT), C-reactive protein (CRP), ferritin, troponin I, urea, creatinine and aspartate aminotransferase (AST), and international normalized ratio (INR) in critical COVID-19 group than in mild and moderate COVID-19 group and controls (P < 0.001, for all).