Which Pulse Oximeter to choose?

The oximeter is a device whose use has become widespread with models adapted for domestic use. SpO2 measurement has become a necessity in the monitoring of long-term oxygen therapy in patients with chronic lung diseases. This monitoring is especially important during physical exertion in such patients.

With the vast choice of oximeters available on the market, it is important to find the model that will best meet the need for quality and performance in SpO2 measurement.

CAN WE TRUST THE MANUFACTURER?

SpO2 measurement accuracy figures are the parameters to look for when purchasing an oximeter. However, it is difficult for a purchaser to know for sure whether these figures comply with international values for the quality requirements of these devices.

There is an international ISO 80601-2-61 standard that can be used as a basis for making the right choice. However, it is difficult in practice to find an oximeter with this standard. The main criterion of choice is based on an inaccuracy of less than 4% for the measurement of SpO2. The oximeters that you will find on the main market sites are those that meet the 60601-1-2 standard, which is not sufficient to attest to a good measurement (standard without metrological value).

In addition to the accuracy of the measured data, it is very easy to see that the alternative brands of lesser quality make savings on the materials used. The capture is a first element but the screen can also hold surprises. The contrast is lower on the lower quality devices. It is then much more difficult to read the data, even almost impossible outdoors:

HOW TO CHOOSE A PULSE OXIMETER?

The direct measurement of SpO2 by sensor does not have the same accuracy as a direct measurement on a blood sample. Only the use of portable pulse oximeters is an ideal solution that makes ambulatory measurement on patients possible. The measurement of SpO2 is subject to physiological limitations, such as the tissue flow, the pulsatile variation of the blood and the local hemoglobin concentration. These limitations are the real impediments to accurate SpO2 measurement.

Pulse oximeters work with different sensors that do not all have the same ability to make the right calculations from the values obtained during the measurement. This makes it difficult to determine which oximeters are available on the market that will be able to meet the accuracy requirements for SpO2 measurement. The international standard ISO 80 601 - 2 - 61 is unfortunately still not well known. It is entitled "Special requirements for basic safety and essential performance for pulse oximeters". This standard governs the reliability of pulse oximeters. It was updated in 2011 and is based on accuracy criteria for SpO2 measurement. While we can't say more, this article at least gives you an idea of what to look for in the instructions: an inaccuracy of less than 4% between 70 and 99% SpO2 (although we don't know if this has been verified).