The present invention centrifuged the unit blood to remove the plasma and platelets, so that the packed cell volume of the red blood cells is 90% or more, and then added the red blood cells to the freezing bag 13 containing the HES solution. Place the cryobag 13 in a freezing frame 20, 21 adapted to maintain a constant thickness of the bag contents, such that the ratio of HES / erythrocytes is below 7% (preferably 6%) w / v. And the positioning of the frames 20, 21 in liquid nitrogen without oscillation, which relates to a method for freezing red blood cells in a standard provided unit which can be stored for a long time and subsequently recovered in a pure enough form for transfusion purposes. .
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