What is the role of applying a gauze pad after blood collection?

Applying a gauze pad after blood collection serves several essential functions, with a primary focus on applying pressure to stop bleeding. When a blood sample is taken, a needle is inserted into the vein, which can create a small puncture site. After the needle is withdrawn, there can be some bleeding from this site. By placing a gauze pad on the site and applying pressure, it helps to constrict the blood vessels, which minimizes blood loss and facilitates quicker clotting.

This immediate application of pressure is crucial in preventing hematomas (blood accumulating outside the blood vessel) and ensuring that the bleeding stops effectively. While the gauze pad may also absorb some excess blood and can help prevent infection by covering the puncture site, its foremost role in this context is to ensure that any residual bleeding is controlled.