Veterinary Technician Practice Exam 2025 – All-in-One Study Guide for Exam Success!

The use of a tourniquet or applying occluding pressure is an effective technique for enhancing the visibility of a vein during a venipuncture. When a tourniquet is applied above the site of venipuncture, it restricts the flow of blood out of the limb, causing the veins to engorge with blood. This makes them more prominent and easier to access. By temporarily occluding venous return, the veins become more distended and visible, which greatly assists in locating the puncture site.

Other techniques, such as massaging the vein, may apply increased blood flow to the area but can be less effective in achieving the same level of distension as a tourniquet. Applying ice could constrict blood vessels and could actually decrease visibility rather than enhance it. Wrapping the limb in a towel does not provide any significant benefit in making veins more visible compared to using a tourniquet, as it does not actively promote venous engorgement. Therefore, using a tourniquet or occluding pressure stands out as the most appropriate method to improve vein visibility during venipuncture.