is about has_specified_output blood coagulation scalar measurement datum assay spectrolyse heparin antifactor-Xa assay Alan Ruttenberg An assay that quantitatively measures heparin in human plasma using Factor Xa and Antithrombin III in excess, where the rate of Factor Xa inhibition is directly proportional to the heparin concentration. The residual Factor Xa activity, measured with a Factor Xa-specific chromogenic substrate, is inversely proportional to the heparin concentration. PMID:19696660#Antifactor-Xa (anti-Xa) was determined using spectrolyse heparin (Xa) (Trinity Biotech plc, Bray, County Wicklow, Ireland). url:http://www.kordia.nl/en/product/hemostasis/specialty_kits__reagens/598/spectrolyse_heparin_anti_xa@2009/08/06 spectrolyse heparin antifactor-Xa assay metadata complete