Gale's World of Health states: "Phlebotomy is the act of drawing or removing blood from the circulatory system through a cut (incision) or puncture in order to obtain a sample for analysis and diagnosis. Phlebotomy is also done as part of the patient's treatment for certain blood disorders."
Medical Laboratory Observer is a lab professionals journal with regular features on phlebotomy and training needs. CINAHL+ has full-text from September 2001 to present here.