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Table 1 Thrombotic risk levels in patients with COVID-19 according to BMI, requirement of O2 or mechanical assistance, and other risk factors of thrombosis

From: Prevention of thrombotic risk in hospitalized patients with COVID-19 and hemostasis monitoring

Low riskIntermediate riskHigh riskVery high risk
Non-hospitalized patient with BMI < 30 kg/m2 and no added risk factors for thromboembolism (such as active cancer, recent history of thrombosis)BMI < 30 kg/m2, without the need for high-flow nasal oxygen therapy or mechanical ventilation, with or without added risk factors for thromboembolism- BMI < 30 kg/m2, under high-flow nasal oxygen therapy or mechanical ventilation, with or without risk factors for thromboembolism
- BMI > 30 kg/m2 without high-flow nasal oxygen therapy or mechanical ventilation, but with added risk factors for thromboembolism
- BMI > 30 kg/m2 with high-flow nasal oxygen therapy or mechanical ventilation, and without added risk factors for thromboembolism
- BMI > 30 kg/m2 with added risk factors for thromboembolism, AND high-flow nasal oxygen therapy or mechanical ventilation
- ECMO (venovenous or veno-arterial)
- Unexplained catheter thrombosis
- Dialysis filter thrombosis
- Marked inflammatory syndrome and/or hypercoagulability
(e.g., fibrinogen > 8 g/l (800 mg/dl) and/or D-dimers > 3 μg/ml or 3000 ng/ml)