Labeling and testing of (99m)Tc streptokinase for the diagnosis of deep vein thrombosis

• A detailed study has been made of the method for labeling streptokinase with 99Tc(m) in order to get a radioactive indicator for rapid scintigraphic visualization of thrombi and emboli. The best method found for preparing 99Tc(m) streptokinase was by reducing 99Tc(m) pertechnetate with 2 μmole SnCl2 at pH 0.7 and then adding 50,000 to 75,000 IU of streptokinase at a final pH of about 2. After 1 hr of equilibration, the labeling efficiency was 75 to 80% as determined by the method of gel chromatography column scanning. The dynamic behavior and distribution of 99Tc(m) streptokinase in different organs was studied in rabbits where a high uptake was found in liver. In a clinical investigation using 99Tc(m) streptokinase prepared according to this work, however, the liver uptake in man was only 10 to 20%.

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