If the tourniquet is not released before withdrawing the needle during venipuncture, what is likely to happen?

When a tourniquet is applied during venipuncture, it temporarily restricts blood flow in the arm, causing the veins to engorge with blood and become more prominent. This is crucial for locating the vein and making the puncture easier. However, if the tourniquet is not released before withdrawing the needle, the continued application of the tourniquet can lead to complications.

The most significant consequence of not releasing the tourniquet before needle withdrawal is the potential for excessive bleeding at the puncture site. The tourniquet causes increased venous pressure due to trapped blood; once the needle is withdrawn and the tourniquet remains, blood will continue to flow from the open site instead of re-establishing normal circulation. Releasing the tourniquet allows for proper flow dynamics to resume, reducing the risk of significant bleeding.

While issues such as hemolysis or multiple puncture sites can arise from improper technique, these outcomes are not directly tied to the failure to release the tourniquet before needle withdrawal. Releasing the tourniquet ensures that bleeding is controlled and minimizes complications for the patient.