The middle finger or index finger is generally considered the most accurate for pulse oximeter readings.
Why the Middle or Index Finger?
According to Lepu Medical, these fingers are preferred due to:
- Adequate blood flow: Ensuring a strong signal for the oximeter to read.
- Thickness of the skin: Providing a suitable surface for the sensor to function effectively.
Factors to Consider
While the middle or index finger are usually the best choices, other factors can influence the accuracy of readings, such as:
- Cold hands: Poor circulation can affect the reading. Warm your hands before taking a measurement.
- Nail polish: Dark nail polish can interfere with the light transmission of the oximeter.
- Movement: Keep your hand still during the reading.
