is about has specified output blood coagulation scalar measurement datum assay spectrolyse heparin antifactor-Xa assay url:http://www.kordia.nl/en/product/hemostasis/specialty_kits__reagens/598/spectrolyse_heparin_anti_xa@2009/08/06 spectrolyse heparin antifactor-Xa assay PMID:19696660#Antifactor-Xa (anti-Xa) was determined using spectrolyse heparin (Xa) (Trinity Biotech plc, Bray, County Wicklow, Ireland). 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. metadata complete