title: Laser nephelometer evaluation of factor IX.
abstract: Laser Nephelometry is a technique which allows the evaluation of the concentration of several serum proteins and clotting factors. By means of this technique it is also possible to study the kinetic of the reaction between antigen and antibody. In a few instances the method was also applied in the characterization of abnormal molecules. We developed assays for the measurement of Factor IX antigen and the results were compared with those obtained by conventional immunological methods such as rocket immunoelectrophoresis. Plasmas from patients with haemophilia B, on coumarin treatment, with liver cirrhosis were studied. A standard reference curve was obtained using pooled normal plasma. The factor IX levels obtained by laser nephelometer correlated fairly well with those obtained by electroimmunoassay.
authors.affiliation: University of Padua Medical School, Institute of Medical Semeiotics, Padua, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Ruzza
authors.forename: A R
authors.initials: AR
authors.lastname: Lazzaro
authors.forename: M L
authors.initials: ML
authors.lastname: Viero
authors.forename: A
authors.initials: A
authors.lastname: Girolami
mesh_terms: D000936:Antigen-Antibody Complex; D003374:Coumarins / Q000627:therapeutic use; D005164:Factor IX / Q000032:analysis*; D006467:Hemophilia A / Q000097:blood*; D007106:Immune Sera; D007700:Kinetics; D007834:Lasers; D008103:Liver Cirrhosis / Q000097:blood; D009391:Nephelometry and Turbidimetry / Q000379:methods; D012016:Reference Values
chemical_list: D000936:Antigen-Antibody Complex; D003374:Coumarins; D007106:Immune Sera; D005164:Factor IX; C030123:coumarin