What is the purpose of applying pressure after a venipuncture?

The application of pressure after a venipuncture primarily serves to minimize bruising and prevent bleeding at the puncture site. When a needle is inserted into a vein, it can cause small blood vessels to break, which may lead to bleeding and the formation of a hematoma (bruising) if immediate pressure is not applied. By applying pressure, you help ensure that the vessel closes and any bleeding is effectively stopped, aiding in the proper healing of the puncture site. This technique is critical for patient care, as it promotes recovery and reduces the risk of complications following the procedure.

The other options do not directly address the primary reason for applying pressure. Speeding up blood collection may seem pertinent, but applying pressure is not about hastening the procedure; rather, it focuses on patient safety and recovery. Ensuring the saturation of the blood sample is not related to pressure application, as that pertains more to how the sample is collected rather than post-collection care. While reducing patient anxiety could be a secondary effect of confident practice and thorough aftercare, the primary purpose of applying pressure remains the prevention of bleeding and bruising.