Patient Monitor User’s Manual
6-1
Chapter 6 Measuring SpO2
6.1 Introduction
The measurement of oxygen saturation of arterial blood
(also known as pulse oxygen saturation, usually shortened as
SpO
2
) adopts the principles of light spectra and volume tracing.
The LED emits lights with two specific wavelengths, which are
selectively absorbed by oxygenated hemoglobin and
deoxyhemoglobin. The optical receptor measures the changes in
the light intensity after the light passes the capillary network and
estimates the ratio of oxygenated hemoglobin and the total
hemoglobin.
Wavelengths of the light emitted by the pulse oximeter
probe are nominally 660nm for red LED and 940nm for infrared
LED.
SpO2 % =
x 100%
oxygenated hemoglobin
oxyhemoglobin + deoxyhemoglobin
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