Laboratory Assays in the Clinical Management of Antiretroviral Therapy

  • Author: Mark Holodniy, MD (More Info)
  • Editors in Chief: Daniel R. Kuritzkes, MD; Joseph J. Eron, Jr., MD
  • Last Reviewed: 12/12/17 (What's New)


  • A tropism assay should be obtained before initiating maraviroc
  • Phenotypic tropism testing is the preferred method in the United States, although international guidelines differ
  • Maraviroc should be considered only in patients with R5 virus and not in the presence of dual/mixed or X4 virus

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Keywords: Tropism