A client has been admitted with probable emphysema. Diagnostic tests have been ordered. Which of the tests will provide the most accurate indicator of the client's acid–base balance?
1. Bronchoscopy
2. Sputum studies
3. Pulse oximetry
4. Arterial blood gases (ABGs)
4. Arterial blood gases (ABGs)
Rationale:
ABGs are done to assess alterations in acid–base balance caused by respiratory disorders, metabolic disorders, or both. A bronchoscopy provides visualization of internal respiratory structures. Sputum studies can provide specific information about bacterial organisms. Pulse oximetry is a noninvasive test that evaluates the oxygen saturation level of blood.
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