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Hemoglobin Concentration and Oxygen Saturation Quiz

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Hemoglobin Concentration and Oxygen Saturation Quiz

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Questions and Answers

Which factor determines how much oxygen blood has the capacity to carry?

Percentage of free O2 molecules

Pulse oximetry accuracy

Partial pressure of O2

Saturation of Hb with O2 (correct)

What is the significance of Po2 in blood?

Reflects the Hb concentration

Determines the oxygen content of arterial blood (correct)

Indicates the amount of free O2 in blood

Measures the oxygen saturation in venous blood

What does SaO2 measure in blood?

Oxygen content in venous blood

Hemoglobin concentration

Oxygen saturation in arterial blood (correct)

Partial pressure of CO2

Why is pulse oximetry less accurate at saturations below 75%?

Due to poor peripheral perfusion Signup and view all the answers

What does Po2 regulate in the context of O2 molecules binding to Hb?

Oxygen saturation (So2) Signup and view all the answers

Why is the percentage of Hb saturated with O2 markedly reduced in CO poisoning?

Because CO has a higher affinity for Hb than O2. Signup and view all the answers

Why is SaO2 reduced in CO poisoning even when PaO2 is high?

Because CO has a higher affinity for Hb than O2. Signup and view all the answers

What effect does a higher Po2 have on So2 according to the text?

Increases it linearly Signup and view all the answers

Why does SaO2 appear normal in CO poisoning according to the text?

Pulse oximeters cannot distinguish carboxyhaemoglobin from oxyhaemoglobin. Signup and view all the answers

In which part of the oxyhaemoglobin dissociation curve do changes in Po2 have a relatively little effect on So2?

'Flat part of the curve' Signup and view all the answers

How does the presence of CO affect the measurement of SO2 in ABG analysis?

It has no effect on the calculated SO2. Signup and view all the answers

At approximately what Pao2 level is hemoglobin maximally saturated according to the text?

13 kPa Signup and view all the answers