Final answer:
The tourniquet can be removed after the first tube during a blood draw to prevent it from being left on for more than 60 seconds, which could result in complications and alter blood test results.
Step-by-step explanation:
When doing multiple vials of blood, the tourniquet can be removed after the first tube so that it doesn't remain in place for more than 60 seconds. The tourniquet is a band that is placed around the arm to restrict blood flow and make veins more prominent for blood collection.
Leaving the tourniquet on for an extended period can lead to venous stasis, which affects the quality of blood samples. After 60 seconds, the tourniquet should be removed to allow normal blood flow. By removing the tourniquet, the possibility of hemoconcentration, clotting, or hemolysis is reduced, resulting in more accurate blood test results.