PO2 corresponding with pulse Ox formula??

Specialties CRNA

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Hi Does anyone know how to figure out if your pulse ox is like 77-80% what should your PO2 be. I know there is a way to do it but i can't remember the formula. Thanks

TX

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The Oxyhemoglobin Dissociation curve........Here is a pretty kewl interactive web site that may help.

http://www.ventworld.com/resources/oxydisso/dissoc.html

Just scroll down a bit and click on the link to the interactive tool....

Hope this is helpful.

Arnie

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a quick rule of thumb

SpO2 pO2

100

90 60

80 50

70 40

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Hey, that website IS kewl! Thanks Arnie, RN, RT.

Does anyone have a compilation of educational websites such as this one and the virtual anesthesia machine? I would like to see more stuff like this, you know, for lirnin.

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The Oxyhemoglobin Dissociation curve........Here is a pretty kewl interactive web site that may help.

http://www.ventworld.com/resources/oxydisso/dissoc.html

Just scroll down a bit and click on the link to the interactive tool....

Hope this is helpful.

Arnie

Thanks i saw that website but totally missed the interactive part. Very neat.

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Specializes in Anesthesia.
Hey, that website IS kewl! Thanks Arnie, RN, RT.

Does anyone have a compilation of educational websites such as this one and the virtual anesthesia machine? I would like to see more stuff like this, you know, for lirnin.

I have a pretty good list of links on our class' website. Visit http://srnaweb.crnasomeday.com and go to the links page. I added ArnieRNRRT's link there too. It really is pretty cool, Arnie!

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Hi Does anyone know how to figure out if your pulse ox is like 77-80% what should your PO2 be. I know there is a way to do it but i can't remember the formula. Thanks

TX

All I can say is to not forget what the OHC does, it gives a quick reference of CaO2 which is way more important that PO2. Your P50 will not be "normal" (i.e PO2 of 50 = CaO2 27) in compromised patients. Also the curve is a sigmoid curve which tells you that very quickly a high PO2 will minutely affect the CaO2. 90/60 is for a healthy patient, in a compromised patient it may be 90/40, etc depending on how the patient's disease process has shifted the curve and ultimately affecting CaO2.

CaO2 = (1.36 x Hb x SaO2/100) + (PO2 x 0.003)

So you can see that PO2 has little effect on oxygen carrying capacity (but I will say it can't hurt...............)

66F

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