For instance, all you have to do use the following formula:
- Estimated PO2 = SpO2 minus 30
This can also be drawn out as the 4-5-6-7-8-9 Rule. It goes like this.
- 4...................7
- 5...................8
- 6...................9
or...
- 40 PO2 = 70 SpO2
- 50 PO2 = 80 SpO2
- 60 PO2 = 90 SpO2
Essentially, SpO2 can be used to estimate PO2 and level of hypoxemia.
90% SpO2
|
60 PO2
|
Mild Hypoxemia
|
No oxygen needed
|
80% SpO2
|
50 PO2
|
Moderate Hypoxemia
|
Oxygen needed
|
70% SpO2
|
40 PO2
|
severe Hypoxemia
|
Oxygen needed
|
Further reading:
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