Phlebotomy is making a puncture in a vein, usually in the arm, with a cannula to draw blood. The procedure is known as venipuncture also used for intravenous therapy. A person who performs phlebotomy is called a phlebotomist. The duties of a phlebotomist may include interpreting the tests requested, drawing blood into the correct tubes with the proper additives, accurately explaining the procedure to the person and preparing them accordingly, practicing the required forms of asepsis, practicing standard and universal precautions, restoring hemostasis of the puncture site, giving instructions on post-puncture care, affixing tubes with electronically printed labels, and delivering specimens to a laboratory.