{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:17:52Z","timestamp":1791850672918,"version":"4.3.4"},"reference-count":95,"publisher":"American Society of Hematology","issue":"3","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,2,9]]},"abstract":"<jats:sec><jats:title>Background:<\/jats:title><jats:p>Coronavirus disease 2019 (COVID-19)\u2013related critical illness and acute illness are associated with a risk of venous thromboembolism (VTE).<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective:<\/jats:title><jats:p>These evidence-based guidelines of the American Society of Hematology (ASH) are intended to support patients, clinicians, and other health care professionals in decisions about the use of anticoagulation for thromboprophylaxis for patients with COVID-19\u2013related critical illness and acute illness who do not have confirmed or suspected VTE.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p>ASH formed a multidisciplinary guideline panel and applied strict management strategies to minimize potential bias from conflicts of interest. The panel included 3 patient representatives. The McMaster University GRADE Centre supported the guideline-development process, including performing systematic evidence reviews (up to 19 August 2020). The panel prioritized clinical questions and outcomes according to their importance for clinicians and patients. The panel used the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach, including GRADE Evidence-to-Decision frameworks, to assess evidence and make recommendations, which were subject to public comment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>The panel agreed on 2 recommendations. The panel issued conditional recommendations in favor of prophylactic-intensity anticoagulation over intermediate-intensity or therapeutic-intensity anticoagulation for patients with COVID-19\u2013related critical illness or acute illness who do not have confirmed or suspected VTE.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions:<\/jats:title><jats:p>These recommendations were based on very low certainty in the evidence, underscoring the need for high-quality, randomized controlled trials comparing different intensities of anticoagulation. They will be updated using a living recommendation approach as new evidence becomes available.<\/jats:p><\/jats:sec>","DOI":"10.1182\/bloodadvances.2020003763","type":"journal-article","created":{"date-parts":[[2021,2,9]],"date-time":"2021-02-09T03:59:59Z","timestamp":1612843199000},"page":"872-888","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":348,"title":["American Society of Hematology 2021 guidelines on the use of anticoagulation for thromboprophylaxis in patients with COVID-19"],"prefix":"10.1182","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3595-5697","authenticated-orcid":false,"given":"Adam","family":"Cuker","sequence":"first","affiliation":[{"name":"Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2745-8057","authenticated-orcid":false,"given":"Eric K.","family":"Tseng","sequence":"additional","affiliation":[{"name":"St. Michael\u2019s Hospital, Division of Hematology\/Oncology, University of Toronto, Toronto, ON, Canada;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robby","family":"Nieuwlaat","sequence":"additional","affiliation":[{"name":"Michael G. 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