title: A new method for the assay of factor XI in plasma and the preparation and use of a new artificial substrate.
abstract: An improved method for the one-stage assay of factor XI in plasma has been proposed; it is reproducible and compares well with an old, established method.A short investigation into the preparation and use of artificially prepared factor XI-deficient plasma has been carried out: this substrate can be used as an alternative to the congenitally deficient substrate.
mesh_terms: D000704:Analysis of Variance; D001331:Automation; D001780:Blood Coagulation Tests; D005165:Factor V / Q000032:analysis; D005167:Factor VII / Q000032:analysis; D005172:Factor XI / Q000032:analysis*; D006801:Humans; D008722:Methods
chemical_list: D005165:Factor V; D005167:Factor VII; D005172:Factor XI