http://choosepath.blogspot.com/ ". Some weeks, we sign out in the morning and gross in the afternoon. Other weeks will consist strictly of grossing and covering frozen sections or signing out and covering frozen sections." "Blood bank involves seeing patients for apheresis procedures during the day as well as working up antibody reactions and transfusion reactions. Chemistry involves signing out protein and hemoglobin electrophoreses for a few hours a day." the only one i think i understand is 'working up' which i think means: preparing the reaction. please someone clear these underlined phrases/word combinations for me... thank you, Peter.