American Medical Technologist (AMT) Practice Exam 2025 – All-in-One Resource to Guarantee Exam Success!

A hematoma during venipuncture is caused when blood leaks from the vein into the surrounding tissue, leading to a localized swelling. The correct answer that identifies a contributing factor to developing a hematoma is related to the partial insertion of the needle bevel into the vein. When the bevel is not fully within the vein, it creates a situation where the puncture is incomplete. As a result, blood can escape from the vein and accumulate in the tissue adjacent to the site of venipuncture, forming a hematoma.

While using a large needle can increase discomfort and the potential for other issues (such as breaking a smaller vein), it does not directly contribute to the formation of a hematoma in the same way. An incorrect angle of needle insertion can also lead to complications, such as missing the vein; however, it doesn’t specifically address the issue of blood leakage once punctured. Finally, inadequate site preparation is important for preventing infections and ensuring good visibility of the vein, but it does not directly cause blood to leak from the vein itself during insertion. Overall, the mechanics of how blood escapes from a partially inserted needle bevel make that answer the best choice in understanding the formation of a hematoma during venipuncture.