Measurement and Properties of Antithrombin

Abstract
Summary.: 1. A unit for antithrombin is defined as the amount of antithrombic substance which inactivates one unit of thrombin.2. A method for the quantitative measurement of antithrombin in plasma and serum is described. Its relation to earlier unsatisfactory methods is discussed.3. The normal antithrombin of ox plasma is investigated and its properties found in accordance with those described by other authors.4. The amount of normal antithrombin in plasma and serum generally ranges from 100 to 150 antithrombin units per ml.Thanks are due to “Danmarks tekniske Højskoles Fond for teknisk Kemi” and to “Løvens kemiske Fabrik”, Copenhagen, for grants in aid of this work.

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