Arterial blood oxygenation measurements

Abstract

According to an aspect, there is provided a computer-implemented method for determining an arterial blood oxygenation, SpO2, measurement for a subject. The method comprises receiving (101) a first and second photoplethysmogram, PPG, signals for the subject. The first PPG signal is obtained using a first wavelength of light and the second PPG signal is obtained using a second wavelength of light, and the first and second PPG signals comprise pulse components relating to blood volume changes in the subject over time. The method also comprises determining (103) a fundamental frequency corresponding to a pulse rate of the subject occurring during the measurement of the first and second PPG signals, and processing (105) one or more higher harmonics of the pulse components of the first and second PPG signals at frequencies higher than the fundamental frequency, excluding the fundamental frequency of the pulse components, to determine an SpO2 measurement for the subject.

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