Handheld monitor user’s manual
Chapter 5-1
Chapter 5 Measuring SpO
2
5.1 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.
oxyhemoglobin + deoxyhemoglobin
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