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The PaO2 test can be used to assess the effects of breathing problems on oxygen supply

The results are often used to determine whether emergency treatment—such as oxygen supplementation or mechanical breathing support—are needed

PaO2 values can also be used (along with other tests) to help in the diagnosis of a number of chronic medical conditions.

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Sudden shortness of breath

Heart attack

Loss of consciousness

Chest or lung trauma

Chronic lung diseases such as asthma, cystic fibrosis, or chronic obstructive pulmonary disease (COPD)

Congestive heart failure