Central or peripheral neuromuscular disorders
Right-to-left shunts of great vessels
Pulmonary embolism and pulmonary infarction
Selected lung cancers
Suggested Additional Lab Testing
If there is a need to monitor blood gases, pCO and blood pH would be useful.
In most of these circumstances, the testing is performed only in the acute setting when there is likely to be a major change in blood gas values. Identifying the specific disorders listed is valuable, because it may indicate the precise cause for the hypoxemia.
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