Factor VIII:Ca chromogenic assay
 A chromogenic assay for determination of blood coagulation Factor VIII:Ca, using an indicator of Factor Xa simultaneously as a measure of Factor VIII:Ca concentration and as an inhibitor of Factor Xa. This technique can be applied to measure the concentration of an activating enzyme using the rate of conversion of the indicator molecule of the product of that enzyme as an indirect indicator of enzyme concentration. 
Dade Behring AG
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Hendrik Coenraad Hendricus Johannes Suzette Lucette
Hemker Kessels BeGuin