Thromboembolism prevention and treatment guidelines in patients with COVID-19 Thromboembolism is an important concern in COVID-19 patients. Here are the three most widely trusted guidelines for prevention of thromboembolism. • American College of Chest Physicians • Inetrnational Society on Thrombosis and Haemostatis • National Institutes of Health Antithrombotic Therapy in Patients with COVID-19 (https://www.covid19treatmentguidelines.nih.gov/antithrombotic-therapy/)