A client has been admitted with chronic obstructive pulmonary disease (COPD). Diagnostic tests have been ordered. Which of the tests will provide the most accurate indicator of the client's acid-base balance?
Bronchoscopy
Pulmonary function tests
Pulse oximetry
Arterial blood gases
The Correct Answer is D
Rationale:
A. Bronchoscopy allows for direct visualization of the airways and may be used for sampling or clearing secretions but does not assess acid-base balance.
B. Pulmonary function tests evaluate lung volume and airflow but are not specific to acid-base status.
C. Pulse oximetry measures oxygen saturation, which reflects oxygenation but not CO₂ levels or pH status.
D. Arterial blood gases (ABGs) are the most accurate test for evaluating acid-base balance, as they provide values for pH, PaCO₂, HCO₃⁻, and PaO₂ — essential indicators in COPD management.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Chloride levels often decrease along with sodium, as they are closely related electrolytes. Hyponatremia is commonly accompanied by hypochloremia.
B. Calcium levels are regulated independently of sodium and are not typically affected by hyponatremia.
C. Potassium may be normal, low, or even high depending on the underlying cause; it is not consistently low with hyponatremia.
D. Magnesium levels do not typically mirror sodium levels and are regulated separately.
Correct Answer is D
Explanation
Rationale:
A. Kidneys are the slowest to respond, so this order is incorrect.
B. Kidneys are slower than lungs, so this order is incorrect.
C. Lungs respond faster than kidneys but slower than chemical buffers, so this order is incorrect.
D. Chemical buffers act immediately to neutralize pH changes (first line), lungs adjust CO₂ levels within minutes (second line), and kidneys regulate acid-base balance over hours to days (third line), making this the correct order.
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