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September 22, 1956


JAMA. 1956;162(4):425. doi:10.1001/jama.1956.02970210165024

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To the Editor:—  Liber and Kramer, in their article "New Method of Preparing Concentrated Erythrocytes for Transfusion" (J. A. M. A.161:862 [June 30] 1956), advocate centrifuging the inverted bottle of blood, thus transferring the red blood cell layer to the outlet end of the bottle, whereby the red blood cells can be given to the patient and the remaining plasma discarded, thus eliminating the dangerous method of aspirating the supernatant plasma from an upright bottle of blood, which is in common use today. Most centrifuges are not equipped with cups large enough to hold blood bottles; hence the adapter cup described, which prevents crushing of the bottle neck during centrifugation, is not likely to find wide use. An effective method that requires no unusual equipment, mentioned but not emphasized in the authors' article, consists of storing a supply of blood of assorted types with the bottles upside down,

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