phlebotomy /fləbot″əmē/ [Gk, phleps + temnein, to cut] , the incision of a vein for the letting of blood, as in collecting blood from a donor. Phlebotomy is the chief treatment for polycythemia vera and may be performed every 2 to 3 months or more frequently if required. The procedure is sometimes used to decrease the amount of circulating blood and pulmonary engorgement in acute pulmonary edema. At one time phlebotomy was practiced for almost every disorder. Also called venesection.