Changes in various coagulation parameters following COVID-19 in a study by Yu et al
| Coagulation parameter | Survivors n=162 | Non-survivors n=21 | Percentage difference |
| PT | 13.6 s | 15.5 s | 13.97 |
| aPTT | 41.2 s | 44.8 s | 8.74 |
| Fibrinogen | 4.51 g/L | 5.16 g/L | 14.41 |
| d-dimer | 0.61 mcg/mL | 2.12 mcg/mL | 247.54 |
| FDP | 4 mcg/mL | 7.6 mcg/mL | 90.00 |
| AT | 91% | 84% | −7.69 |
aPTT, activated partial thromboplastin time; AT, antithrombin; FDP, fibrin degradation products; PT, prothombin time.