Oxygen saturation levels are routinely monitored
in clinical settings. Pulse oximetry, in transmittance operation
mode, is the most common method of estimating oxygen satu-
ration (SpO
2
). This is inexpensive and non-invasive and thus
allows for long-term monitoring. However, it suffers from issues
such as signal integrity, reliability and patient comfortability.
As a result, there is an interest in exploring other locations on
the body where oxygen saturation can be measured reliably. In
this paper, a wearable device has been designed to study the
feasibility of extracting photoplethysmogram (PPG) signals at
the neck in reflectance pulse oximetry mode. It explores the
signal integrity and strength compared to other locations as
well as the presence of motion artefacts in that location. The
results demonstrate that the PPG signals acquired at the neck
show a very strong correlation (r=0.82) with the SpO
2
values
obtained using a commercial device. Further, the SpO
2
values
are calculated with an accuracy of 98.6%.