How long should a tourniquet be applied?

How long should a tourniquet be applied?

• A. Thirty seconds
• B. One minute
• C. Two minutes
• D. Five minutes

Answer: (B)

The main idea is to balance making veins easier to access with keeping the blood sample accurate. A tourniquet helps veins appear more prominently by slowing venous return, which makes it easier to palpate and puncture a good vein. But leaving it on too long causes venous stasis, which can concentrate the blood and alter lab values, and it can also increase discomfort or risk of nerve compression. Because you want a reliable sample and a comfortable procedure, about one minute is the optimal duration. If a suitable vein isn’t found within that time, release, adjust the position, or try another site and reapply briefly.

The main idea is to balance making veins easier to access with keeping the blood sample accurate. A tourniquet helps veins appear more prominently by slowing venous return, which makes it easier to palpate and puncture a good vein. But leaving it on too long causes venous stasis, which can concentrate the blood and alter lab values, and it can also increase discomfort or risk of nerve compression. Because you want a reliable sample and a comfortable procedure, about one minute is the optimal duration. If a suitable vein isn’t found within that time, release, adjust the position, or try another site and reapply briefly.