Summary
A method for the preparation of standard fibrin clots labeled with radioactive mercury
is described. When suspended in aqueous solutions of streptokinase, urokinase and
trypsin, the release of radioactivity from the clot is proportionate to the rate of
lysis. The per cent of remaining clot measured by the radioactive method and a tyrosine
assay is comparable. Hg203 labelled clots are easy to prepare and may be stored for approximately 2 months.