• The primary goal of this study was to assess the rate and characteristics of thromboembolic complications in patients with COVID-19.

• The data included in the study was obtained from COVID-19 positive patients admitted to Humanitas Clinical and Research Hospital, Rozzano, Milan, Lombardy, Italy since February 2020.

• 388 patients were assessed in the study – the median age was 66, 68% were men, and 16% required intensive care in the ICU.

• Thromboembolic complications occurred in 28 patients and half of these events were diagnosed within 24 hours of hospital admission.

• Thromboembolic events observed were cases of pulmonary embolism, ischemic stroke, myocardial infarction, and disseminated intravascular coagulation.

• The high level of thromboembolic events observed and diagnosed within 24 hours of admission suggest a substantial rate of thromboembolic risk associated with COVID-19 positive patients.