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In both conditions, hypoxia can lead to polymerization of sickle hemoglobin, changes in red cell mechanical properties, and impaired blood flow. Here, we test the hypothesis that differences in the oxygen\u2010dependent rheological properties in the two conditions might help explain the difference in clinical phenotypes. We use a microfluidic platform that permits quantification of blood rheology under defined oxygen conditions in physiologically sized microchannels and under physiologic shear rates. We find that, even with its lower sickle hemoglobin concentration, sickle trait blood apparent viscosity increases with decreasing oxygen tension and may stop flowing under completely anoxic conditions, though far less readily than the homozygous condition. Sickle cell trait blood flow becomes impaired at significantly lower oxygen tension than sickle cell disease. We also demonstrate how sickle cell trait can serve as a benchmark for sickle cell disease therapies. We characterize the rheological effects of exchange transfusion therapy by mixing sickle blood with nonsickle blood and quantifying the transfusion targets for sickle hemoglobin composition below which the rheological response resembles sickle trait. These studies quantify the differences in blood flow phenotypes of sickle cell disease and sickle cell trait, and they provide a potentially powerful new benchmark for evaluating putative therapies <jats:italic>in vitro<\/jats:italic>.<\/jats:p>","DOI":"10.1002\/ajh.25227","type":"journal-article","created":{"date-parts":[[2018,7,23]],"date-time":"2018-07-23T07:58:55Z","timestamp":1532332735000},"page":"1227-1235","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Oxygen\u2010dependent flow of sickle trait blood as an <i>in vitro<\/i> therapeutic benchmark for sickle cell disease treatments"],"prefix":"10.1002","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3875-7346","authenticated-orcid":false,"given":"Xinran","family":"Lu","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering University of Minnesota  Minneapolis 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