Certified Pulmonary Function Technologist (CPFT) Practice Exam

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Prepare for the Certified Pulmonary Function Technologist Exam. Utilize flashcards and multiple-choice questions, with hints and detailed explanations for each. Ensure your success and confidence in the exam!

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What is the primary function of a Clark electrode in a blood gas analyzer?

Measure pH levels
Analyze CO2 concentration
Analyze PO2 levels
Measure carbon monoxide levels

The correct answer is: Analyze PO2 levels

The primary function of a Clark electrode in a blood gas analyzer is to analyze PO2 levels. This electrode operates on the principle of electrochemical reduction, where it measures the partial pressure of oxygen in a sample by detecting the current generated when oxygen molecules are reduced at a cathode surface. Specifically, the Clark electrode uses a membrane that is selectively permeable to oxygen, allowing it to measure how much oxygen is present in a liquid sample, such as blood. By accurately determining the partial pressure of oxygen, healthcare providers are better able to assess a patient's oxygenation status, which is critical in a variety of clinical situations, including respiratory distress, monitoring of ventilator settings, and evaluating the efficacy of oxygen therapy. Understanding the functionality and accurate application of the Clark electrode is crucial for proper analysis and patient management in pulmonary care.