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A chemical method has been devised for the quantitative determination of plasma antithrombin. A concentrate of antithrombin has been prepared from plasma. It also contains heparin cofactor activity. The two distinct activities could not be separated and may quite possibly be the properties of a single substance. When the concentrate is combined with heparin the capacity of the concentrate to destroy thrombin is not increased but there is interference with the thrombin fibrinogen interaction. In a mixture of the concentrate and thrombin there is simultaneous destruction of antithrombin, and thrombin activities. Small amounts of the concentrate significantly prolong the clotting time of blood.

Studies on the Antithrombin and Heparin Co-factor Activities of a Fraction Adsorbed from Plasma by Aluminum Hydroxide