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How is the oxygen content monitored in blood?

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in Clinical Science by (102k points)
How is the oxygen content monitored in blood?

(a) By Korotkoff Sounds

(b) By Pulse Oximetry

(c) By Fluorescence

(d) By luminescence

The question was asked by my school principal while I was bunking the class.

Origin of the question is Measuring Blood Pressure & Pulse Oximetry in chapter Diagnostic Investigation in Neurology and Cardiology of Clinical Science

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Correct answer is (b) By Pulse Oximetry

Best explanation: Pulse Oximetry is used to measure the oxygen saturation of the blood. In this process, light a light and a detector is used. It is normally in a band or a clip with the light source and the detector at the opposite ends. The light is projected at the finger and it is detected on the nail side. The light has an absorbance ratio which determines the amount of oxygen that is present in the blood.

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