Similar results were found in a study of 184 ICU patients with COVID-19 pneumonia on thromboprophylaxis; 27% had pulmonary embolism or deep vein thrombosis.70 Laboratory testing of hospitalized patients with COVID-19 shows elevated fibrinogen, D-dimer, vWF (von Willebrand factor), and factor VIII. Here, VWF is linked to deep vein thrombosis.