The iron sucrose was added to heparinized blood samples from each healthy subject at various concentrations, 0, 20, 100, 200 mg/L and incubated for 4 hr and 24 hr at 37° C. Gram positive (Staphylococcus Aureus) and Gram negative (Escherichia Coli) bacteria were used for the evaluation of phagocytic function in PMNs. The phagocytic function against Gram positive and negative bacteria was evaluated by flow cytometry. A: Representive FACS data for phagocytic function against gram positive bacteria. B: Phagocytic function against Gram negative and positive bacteria after 4 hours incubation with iron sucrose. C: Phagocytic function after 24 hours incubation with iron sucrose. * P<0.05, ** P< 0.01, *** P<0.005.