# Factors affecting the measurements of peripheral oxygen saturation values in healthy young adults

## TL;DR

This study found that posture, gender, and body weight affect oxygen saturation readings in young adults' fingers.

## Contribution

The study identifies how body position, gender, and BMI influence peripheral oxygen saturation measurements in healthy young adults.

## Key findings

- Oxygen saturation in the middle finger was higher in the upright position compared to the supine position.
- Female participants had higher oxygen saturation values than males in both finger positions and postures.
- Underweight individuals had higher oxygen saturation values than overweight individuals in both postures.

## Abstract

The aim of the study was to examine peripheral oxygen saturation values in the index and middle fingers of the dominant hand in healthy young adults measured while lying in a supine position or sitting straight up.

This study was a non-randomized and non-controlled, quasi-experimental repeated measures study. It was conducted with 200 healthy young adults in Turkey. A pulse oximeter was located at the same time on the index and middle fingers of the active hand of each participant while sitting upright, and after being kept there for 1 min, the results of the measurements were recorded. Later, the participants were brought into a supine position, and after 10 min of rest, measurements with a pulse oximeter placed on the index and middle fingers of the active hand were repeated in the same way.

The mean age of the participants was 20.4 ± 1.8 years; 76.5% were female, and their mean body mass index was 22.5 ± 3.6 kg/m2. It was found that when the individuals were sitting upright, the peripheral oxygen saturation values measured from the middle finger were significantly higher than the peripheral oxygen saturation values measured from the middle finger in the supine position (p = 0.003). It was found that the peripheral oxygen saturation values of female participants measured from the index finger in the upright sitting position and from the index and middle fingers in the supine position were significantly higher than the saturation values of male participants (p = 0.018, p < 0.001, p = 0.001, respectively). In addition, it was found that the peripheral oxygen saturation values measured from the index and middle fingers of underweight individuals in the sitting position and from the index and middle fingers in the supine position were significantly higher than the saturation values of overweight individuals (p = 0.021, p = 0.006, p = 0.001, respectively).

In the conclusions of this study, it was found that the highest oxygen saturation value of the young adults was measured from the middle finger when they were in the upright sitting position. It was also found that the variables of gender and body mass index significantly affected the peripheral oxygen saturation value.