Technetium-99m labelled urokinase (a kind of embolus imaging agent) has been successfully applied to the clinical work in our department. Apart from the biological activity

this paper reported two methods for the measurement of the activity of the

99m

Tc-urokinase. One was air bubble method

another was fibrinous stereotyped method. Both of them appeared some advantages of a high-speed

simple

convenient

reliable and easy to practice.