H100N Pulse Oximeter User Manu Principles of Operation
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To compare functional saturation measurements to those
from an instrument that measures fractional saturation,
fractional measurements must be converted as follows:
7.3 Measured Versus Calculated
Saturation
When saturation is calculated from a blood gas partial
pressure of oxygen (PO
2
), the calculated value may
differ from the SpO
2
measurement of a pulse oximeter.
This usually occurs because the calculated saturation
was not appropriately corrected for the effects of
variables that shift the relationship between PO
2
and pH,
temperature, the partial pressure of carbon dioxide
(PCO
2
), 2,3-DPG, and fetal hemoglobin.
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