The Reason Why Carbon Monoxide Is Used in DLCO Studies

question 19

Multiple Choice

The reason why carbon monoxide is used in DLCO studies instead of oxygen is because carbon monoxide is:

• A) more readily available than oxygen.
• B) neither diffusion nor perfusion limited.
• C) perfusion limited and not diffusion limited.
• D) diffusion limited and not perfusion limited.

---

Definitions:

Law of Diminishing Marginal Utility

The principle that as a person increases consumption of a product, there is a decline in the marginal utility that person derives from consuming each additional unit.

Ability-To-Pay Principle

The idea that those who have greater income (or wealth) should pay a greater proportion of it as taxes than those who have less income (or wealth).

Marginal Cost

the additional cost incurred to produce one more unit of a good or service.

Marginal Benefit

The added joy or utility one achieves by consuming an additional unit of a product or service.