<prompt> One unit of fresh blood raises Hb Hemoglobin concentration by0.1gm0.5 gm1gm2 gm  <response>: Single unit of whole blood raises Hb by 1 gm and Hematocrit by 3 More than 70 of transfused cells will be ble after 24 hours Ref: Harrisons 19th edition Pgno :138 