Oxygen Measurement

Oxygen measurements in arterial blood can be made using various parameters including gas tension (PaO2), blood oxygen content (CaO2) and haemoglobin oxygen saturation (SaO2).

These parameters are all related to each other in the oxygen dissociation curve. Current measurement techniques can be applied either 'in vitro', i.e. remote from the patient using samples of gases or blood collected from the patient; or alternatively they can be applied directly to the patient, enabling 'in vivo' measurements to be made. The 'in vivo' measurements usually employ the same basic technology as the 'in vitro' methods, but have been adapted to provide immediate bedside results.

In Vitro Measurements of Oxygen Concentrations

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