Cannulation is a medical procedure that involves inserting a tube or cannula into a vein or an artery to draw blood or administer medication. The term cannulation is interchangeable with the words cannulization, catheterization, and venipuncture. Catheterization is a more common term for the insertion of a tube for medical purposes. Venipuncture refers more specifically to the puncturing of a vein for obtaining blood samples. While catheterization and venipuncture are particular types of canulization, cannulization broadly refers to the overall process of inserting a tube into a patient's body for medical purposes.