Understanding IVs: Materials and How They Work

An intravenous injection (IV) is a method of introducing medication or fluids directly into a vein. The most common type of IV is a small, plastic tube called an intravenous catheter, or simply a catheter. Catheters are typically made of a flexible material such as polyethylene or polyurethane. They are inserted into a vein in the arm, hand, or other part of the body, and then taped in place.

Once a catheter is in place, it can be used to deliver medication or fluids directly into the bloodstream. This is often done when a person is unable to take medication by mouth, or when they need to receive a large amount of fluid quickly.

IVs are also used to draw blood for tests, or to give a person a blood transfusion.