An abnormal plasma antithrombin with no apparent affinity for heparin.

Congenital antithrombin abnormality was found in several members of a French family. No history of thrombotic episodes was associated with this abnormality. Plasma antithrombin concentration as well as the rate of thrombin inactivation by defibrinated plasma in the absence of heparin were normal.

[Detection of the HBs antigen. Analysis of an interlaboratory of different methods of detection used in the blood banks of the central region].

A one year study has been performed between six blood Banks of the Centre of France in order to evaluate, among a population of donors found to be positive for HBs Ag by a radioimmunoassay, the number of those who were not detected by Enzyme immunoassay or passive hemagglutination. This study provides a good basis for comparing the sensitivities of the different methods used for Hbs Ag testing.