The mystery of blood drawing: Why is the “left ring finger” the “lucky finger for blood drawing”?

As a fast and common test method, peripheral blood sampling is widely used in blood routine examinations. Are you curious why doctors always choose the left ring finger for blood sampling? Let us unveil its scientific veil.

Image source: Pixabay

1. Easy to operate, safe and reliable

Fingers are one of the most flexible parts of the human body, making them easy for doctors to operate. The rich capillary network on the fingertips can not only meet the needs of blood collection, but also avoid the risk of touching large blood vessels, ensuring a safe and worry-free blood collection process.

2. Little impact on function and quick recovery

Most people use their right hand more frequently, so choosing to draw blood on the left hand can reduce the impact on daily life. The ring finger has relatively weak function, so it recovers quickly after blood drawing and is not likely to affect fine movements of the hand.

3. Low risk of infection and mild pain

The synovial bursa of the ring finger is independent and superficial, so even if it gets infected, it will not affect the deep part of the palm or other fingers. At the same time, blood sampling from the ring finger mainly stimulates the ulnar nerve endings, and the pain is relatively mild.

4. The amount of blood collected is moderate and the results are accurate

The peripheral blood volume of the ring finger is moderate, which can not only meet the inspection needs but also avoid hemolysis caused by excessive squeezing, thus ensuring the accuracy of the test results.

In summary, the choice of the left ring finger for peripheral blood sampling is based on convenience, safety, little impact on function, low risk of infection, and light pain. Behind this small choice, there is actually scientific wisdom. When visiting the hospital, please rest assured to cooperate with the medical staff's operation and jointly protect your health.

Source: Chongqing Banan District Second People's Hospital

Audit experts: Du Guo, Bao Zhonghui

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