 Objective of the investigation The Ultegra RPFA is an automated turbidimetric whole blood assay designed to assess platelet function on the basis of the ability of activated platelets to bind to fibrinogen12. The Ultegra RPFA is as accurate and precise as conventional turbidimetric platelet aggregometry13, and a recent study has demonstrated that the measurements are not operator dependent or influenced by concomitant medications, hematologic parameters, or demographics14. 