In the OR, humidity should be maintained within which range?

In the OR, humidity should be maintained within which range?

• A. 10%-30%
• B. 40%-70%
• C. 20%-60%
• D. 20%-40%

Answer: (C)

Controlling humidity in the operating room helps prevent static electricity and keeps the environment comfortable and safe for both patients and staff. Maintaining relative humidity in the 20–60% range reduces the risk of static discharges near flammable anesthetics and equipment, while avoiding excessive moisture that can promote condensation and microbial growth. Humidity that’s too low (10–30%) increases static risk and can dry mucous membranes; too high (40–70%) raises condensation and infection concerns. The 20–60% range provides the balance needed for safety and comfort.

Controlling humidity in the operating room helps prevent static electricity and keeps the environment comfortable and safe for both patients and staff. Maintaining relative humidity in the 20–60% range reduces the risk of static discharges near flammable anesthetics and equipment, while avoiding excessive moisture that can promote condensation and microbial growth. Humidity that’s too low (10–30%) increases static risk and can dry mucous membranes; too high (40–70%) raises condensation and infection concerns. The 20–60% range provides the balance needed for safety and comfort.