Pulse oximetry accuracy is greatest on which fingers?

Pulse oximetry accuracy is greatest on which fingers?

• A. fingers 3 and 4
• B. thumb and index
• C. ring and pinky
• D. middle and index

Answer: (A)

The most accurate pulse oximetry readings come from a site that provides a strong, regular pulsatile signal with minimal motion and interference. The middle and ring fingers typically offer robust peripheral perfusion and are less prone to movement artifacts than the thumb or index finger. The thumb tends to move a lot with grip and can have variable signals, while the index finger can also be affected by movement and other factors. The pinky finger often yields a smaller, weaker signal. So placing the sensor on the middle or ring finger usually gives the most reliable oxygen saturation readings.

The most accurate pulse oximetry readings come from a site that provides a strong, regular pulsatile signal with minimal motion and interference. The middle and ring fingers typically offer robust peripheral perfusion and are less prone to movement artifacts than the thumb or index finger. The thumb tends to move a lot with grip and can have variable signals, while the index finger can also be affected by movement and other factors. The pinky finger often yields a smaller, weaker signal. So placing the sensor on the middle or ring finger usually gives the most reliable oxygen saturation readings.