The aim of this work was to obtain a freeze-dried kit for direct99mTc-labeling of human polyclonal IgG. The labeling procedure was carried out by Schwarz's method. The best yields of99mTc-IgG were obtained by using sodium pyrophosphate decahydrate as a weak chelating agent. Performed tests showed the stability
of the radiopharmaceutical up to 24 hours. Plasma clearance in rats was fitted to a biexponential curve withT1/2α=(0.1 ±0.9) h andT1/2β=(10±3) h. The organs with higher uptake of radiopharmaceutical were lung, kidneys and blood. In a rabbit model the abscess
target/background ratio was 3–6 according to time of the scintigraphic images. Thirty patients with musculoskeletal infection
were studied. Twenty-one lesions were detected and confirmed by culture/biopsy.