Abstract

The extent of plasma protein-binding of 99 m Tc-methylene diphosphonate (MDP) at 10 min, 1, 2 and 3 h after injection into patients has been determined by trichloroacetic acid and ammonium sulfate precipitation, dialysis and Sephadex gel chromatography. The percent administered dose bound to plasma proteins decreases with time, whereas the fraction of the plasma activity bound to plasma proteins increases with time after injection. Urinary excretion of the tracer is about 38% at 2 h and 62% at 24 h. The results suggest that the rate of removal of 99 m Tc-MDP by bone uptake and urinary excretion is much faster than the rate of disappearance of the protein-bound tracer.

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