Leukocyte-depleted red cell concentrate (RCC) and plasma were separated by a hollow fiber filter system combined with a leukocyte filter without any additional devices. The RCC with 100 ml additive solution had a weight of 329 g; hematocrit was 0.55, free hemoglobin 16 mg/dl; leukocytes were (0.6 +/- 0.6) x 10(9)/l. The plasma (268 g) contained 5.4 g/dl of total protein, and only a few blood cells; clotting factor VIII activity 75%, all satisfying the guidelines.
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