Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What is the normal DLCO value?

  1. 15 mL/CO/min/mm Hg

  2. 20 mL/CO/min/mm Hg

  3. 25 mL/CO/min/mm Hg

  4. 30 mL/CO/min/mm Hg

The correct answer is: 25 mL/CO/min/mm Hg

The DLCO, or diffusing capacity of the lungs for carbon monoxide, is a crucial test used in pulmonary function testing to assess how well oxygen and carbon dioxide are exchanged across the alveolar-capillary membrane. The normal DLCO value typically falls within the range of approximately 20 to 25 mL/CO/min/mm Hg, depending on a variety of factors including age, sex, and body size. When considering the choice of 25 mL/CO/min/mm Hg, this value aligns with standard reference ranges seen in clinical practice, indicating a robust gas exchange capacity in healthy individuals. It reflects optimal lung function and efficient diffusion processes, which are essential for maintaining adequate oxygenation in the bloodstream. This normal DLCO value is critical when diagnosing and monitoring various pulmonary diseases, since a decreased DLCO may indicate conditions such as pulmonary fibrosis or emphysema, while an increased DLCO can sometimes be seen in conditions like asthma or conditions leading to increased pulmonary blood flow. Understanding the importance of the DLCO measurement helps in evaluating lung capability and overall respiratory health.

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