With the US Food and Drug Administration's recent label change of warfarin to include
genetic testing for warfarin sensitivity, manufacturers are developing assays, and
laboratories are offering testing. This article describes the genetic variants for which testing
is available. Current technologies and assays are compared, including considerations for
laboratories in choosing a method. Finally, laboratory issues that apply to all methods, such
as quality control and proficiency testing as well as service issues including turn-around …