The instrument principle used to determine oxygen saturation (O2SAT) in ABG analysis is:

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Multiple Choice

The instrument principle used to determine oxygen saturation (O2SAT) in ABG analysis is:

Explanation:
Oxygen saturation in ABG analysis is determined by spectrophotometric analysis (co-oximetry). Light is shone through the blood and measured at several wavelengths where oxyhemoglobin and deoxyhemoglobin absorb differently. By assessing these absorbance differences and applying the Beer-Lambert law, the instrument calculates how much of the hemoglobin is in the oxygenated form versus the total hemoglobin, giving the saturation. This multi-wavelength approach also allows identification of other hemoglobin species that can affect the reading. Potentiometry, chromatography, and fluorimetry do not quantify Hb oxygenation directly, so they aren’t used for determining O2 saturation in ABG.

Oxygen saturation in ABG analysis is determined by spectrophotometric analysis (co-oximetry). Light is shone through the blood and measured at several wavelengths where oxyhemoglobin and deoxyhemoglobin absorb differently. By assessing these absorbance differences and applying the Beer-Lambert law, the instrument calculates how much of the hemoglobin is in the oxygenated form versus the total hemoglobin, giving the saturation. This multi-wavelength approach also allows identification of other hemoglobin species that can affect the reading. Potentiometry, chromatography, and fluorimetry do not quantify Hb oxygenation directly, so they aren’t used for determining O2 saturation in ABG.

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