Abstract
Summary
1. A test is described to measure the FSF activity of plasma. 2. Under the conditions defined, normal human plasma gives a critical FSF value in amounts between 0.1 and 0.2 ml. 3. There is an indication for elevated FSF values under pathologic conditions. 4. The FSF activity of serum is greatly reduced as compared with levels in plasma, because FSF is strongly adsorbed to fibrin. 5. It is suggested that the physiological formation of a urea-insoluble plasma clot is a prerequisite for normal clot retraction, and that the plasma component needed for syneresis may turn out to be identical with FSF.
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