Why blood oxygen monitoring is typically done on the finger rather than the wrist？

07/25/2024 | SLEEPON | Blog | 1 Comment

Measurement Accuracy

The finger has a higher density of blood vessels and a richer capillary network, allowing the pulse oximeter to more accurately detect blood oxygen levels. In contrast, the wrist has fewer blood vessels and lower blood flow, which may lead to less accurate measurements.

Signal Strength

On the finger, the sensor can more easily obtain a strong and clear light signal because the skin at the fingers is thinner and the blood vessels are closer to the surface. The wrist has thicker skin, which can interfere with light signal transmission, leading to signal attenuation and measurement errors.

Fewer Interference Factors

The finger has a smaller range of movement and can remain relatively still, reducing interference caused by motion during measurement. The wrist, being more active, is subject to more motion interference, which can make measurements less stable.

Wearing Comfort

Finger pulse oximeters are generally designed as lightweight clips or ring-shaped devices, providing comfort for the user. To achieve the same accuracy, a wrist pulse oximeter might need to be larger and tighter, affecting user comfort.

Overall, the finger is an ideal site for blood oxygen monitoring, offering higher measurement accuracy and stability while ensuring user comfort. Order Go2sleep 3 , enjoy accurate, non-sensitized blood oxygen measurements! Super Early bird discount ends in just over ten hours! Shop Now！