Review Note
Last Update: 12/13/2023 09:07 PM
Current Deck: 1 CRNA::Apex Ankisthesia::Ankisthesia::M&M::06 Noncardiovascular Monitoring
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{{c1::Oxy}}hemoglobin absorbs more {{c2::infrared}} light ({{c2::940}} nm).
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It obeys the Lambert–Beer law
Specifically, oxyhemoglobin (HbO2 ) absorbs more infrared light (940 nm), whereas deoxyhemoglobin absorbs more red light (660 nm) and thus appears blue, or cyanotic, to the naked eye.
The ratio of the absorptions at the red and infrared wavelengths is analyzed by a microprocessor to provide the oxygen saturation (SpO2 ) of arterial blood based on established norms.
Co-oximeter in an ABG machine will use four frequencies to measure all four hemoglobins
940 nm - infrared light used to measure oxyhemoglobin
660 nm - red light used to measure deoxyhemoglobin
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