Where Can You Use A Pulse Oximeter?

To be able to get an accurate reading, a pulse oximeter probe must be placed on a translucent part of the body so that light emitted from the light transmitter will be received by the photodetector on the opposite side. Here, we discuss the familiar sites to measure SpO₂ or the oxygen saturation of the blood.

Fingertip

Most probes are designed to be clipped unto a finger. The main reason behind this is that the digit is the most accessible segment of the body. It can be monitored for any interferences or factors that can affect the accuracy of a reading such as obstructed blood flow.

One issue in using a fingertip probe is the presence of acrylic or nail polish. Earlier studies have proven that certain dyes and nailpolish can affect the measurement of oxygen saturation, particularly black, green, and blue on the basis of spectrophotometry. They have concluded that it should be a routine procedure to remove any nailpoilish prior to pulse oximeter usage. However, with the continued development in pulse oximeter technology, most modern devices are already designed to sort out tissues and interferences such as a nail polish, making them more accurate as ever.

Earlobe

Earlobe sensors are like fingertip probes that can be clipped either on the tip or lower part of the pinna (earlobe). They are used whenever there are medical anomalies with the hands or fingers that hinder precise measurement of oxygen saturation.

Toes

In terms of translucency, the toes are as good as the fingers as a pulse oximeter measuring site. The toes may be used depending on the condition of a person–pulse oximetry of the toes is very helpful in detecting problems in arterial blood flow such as in lower extremity arterial disease.

In neonates, the big toe is more preferred site.

Soles and Palm

The sole of the foot is another measuring site that is used commonly in infants. Pulse oximeter probes that are used on the palm and soles utilize a wrap sensor instead of the ones that are clipped. Currently, no wireless sensor has been created to use on the palm and sole.