The insertion of a needle or cannula into vein for the purose withdrawing blood is?

The insertion of a needle or cannula into vein for the purpose of withdrawing blood is called venipuncture. It is a common medical procedure performed by healthcare professionals to collect blood samples for various laboratory tests, such as complete blood count (CBC), blood chemistry, and serology. Venipuncture involves selecting a suitable vein, typically in the arm, and using a sharp needle or cannula to puncture the vein and draw blood into a collection tube or syringe. The procedure requires proper training and technique to ensure patient safety and accurate sample collection.