Oxygen content | Human anatomy and physiology | Health & Medicine | Khan Academy

Learn how oxygen content (CaO2) is related to Hemoglobin concentration (Hb), oxygen saturation (SaO2), and the partial pressure of oxygen (PaO2). Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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[@tariquenor]

very nicely explained.

[@jf0629]

Very well done! Keep up the great teaching! I'm trying to learn about the lungs and lung function!

[@kuhataparunks]

Helped a lot clearly explained thank you very much

[@exoandsnsdstanr7687]

Thank you😍✌

[@sadiakhanraka9362]

So thankful to you ☺

[@nathantjenkins93]

does hematocrit percentage determine the oxygen carrying capacity? or is it the hemoglobin itself?

[@nellyhoffman6194]

Thanks khan

[@boltingvenom82]

Does oxygen bound hemoglobin contribute to PaO2 in arterial blood?

[@ashleygesty7671]

thank you so much!

[@joshuagoldberg1839]

Thanks !!!!!

[@GamingCertification]

What's spo2

[@Anggelos876]

This is an indirect measurement of SaO2. So it tells you how much O2 is bound to Hb.
The disadvantage of this is that this does not tell about all the O2 in the blood, as we just saw that O2 is in plasma as well.
Also O2 bound to blood does not mean that O2 is being delivered to the tissue, as the O2 can be bound to Hb, as related by the O2 dissociation curve.