What is the purpose of applying pressure after completing a venipuncture?

Applying pressure after completing a venipuncture serves the critical purpose of promoting clotting and preventing bleeding. When a needle is inserted into a vein, it creates a small wound. Removing the needle can leave the puncture site vulnerable to bleeding, especially if the patient has issues related to blood clotting or if the venipuncture was performed on a larger vein.

By applying pressure directly to the site, you help encourage the blood to clot at the puncture site. The application of pressure can assist in sealing the opening in the vein and initiate the body’s natural clotting process. This action decreases the risk of significant bleeding and helps prevent the formation of a hematoma, which is a collection of blood outside of blood vessels.

Other considerations, such as preventing swelling and ensuring sample integrity, are important, but they are secondary effects of proper technique and post-venipuncture care. The most direct and immediate reason for applying pressure is to manage bleeding effectively.