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Circulation clearance rate of radioiodine during fibrinogen uptake tests.

Scintillation counts, following administration of 125I-labeled fibrinogen, were performed on the legs of medical and surgical patients. As part of the test procedure, precordial count rates were recorded and used in calculating the fibrinogen clearance rates. A short half-time for the circulating radioiodine was found to correlate well with the detection of venous thrombosis.