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Though DOACs are characterized by fixed-dose prescribing and generally do not require routine laboratory drug-level monitoring (DLM), circumstances may arise where the DLM may aid in clinical decision-making, including DOAC dose adjustment, anticoagulant class change, or decisions to withhold or administer reversal agents. We review the current literature that describes high-risk patient groups in which DLM may be beneficial for improved patient anticoagulation management and stewardship. The review also summarizes the limitations of conventional coagulation testing and discuss the emerging utility of quantitative methods for routine and rapid emergent evaluation of DOAC drug levels\u2014in particular, the Anti-Xa activity to detect Factor Xa Inhibitors (rivaroxaban, apixaban, and edoxaban). Both technical and regulatory barriers to widespread DLM implementation are limiting factors to further clinical research that must be overcome, in order to propose universal DOAC DLM strategies and provide clinical-laboratory correlation to formally classify high-risk patient groups.<\/jats:p>","DOI":"10.1177\/10760296241241524","type":"journal-article","created":{"date-parts":[[2024,4,23]],"date-time":"2024-04-23T01:00:40Z","timestamp":1713834040000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":15,"title":["Challenges to Laboratory Monitoring of Direct Oral Anticoagulants"],"prefix":"10.1177","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8348-4893","authenticated-orcid":false,"given":"Jesse","family":"Qiao","sequence":"first","affiliation":[{"name":"Irvine Department of Pathology and Laboratory Medicine, University of California, Orange, CA, 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