Category 1 support gases are characterized by which statements?

• A. Permitted to power medical-surgical tools
• B. Subject to greater hazards than other piped gases
• C. Used for respiration
• D. Both A and B

Answer: (D)

Category 1 support gases are those that provide energy to pneumatic medical equipment rather than simply supplying breathable gas. They are used to power medical-surgical tools that rely on compressed gas. Because they deliver energy, these gases carry higher hazard potential than other piped gases, requiring stricter safeguards, labeling, and system controls to prevent misdelivery or energy-related incidents. They are not used for respiration, which is why a statement about breathing gases would not apply to Category 1. So the best choice is the one that affirms both that they power pneumatic tools and that they pose greater hazards, while noting that respiration is not a characteristic of these gases.