Certified Surgical Technologist (CST) Practice Exam

What is the optimal temperature range for steam sterilization?

1. 250-260°F

2. 270-276°F

3. 280-290°F

4. 300-310°F

The correct answer is: 270-276°F

The optimal temperature range for steam sterilization is generally recognized as being between 270 and 276°F (approximately 132 to 135°C). This temperature range is effective for achieving the sterilization of most surgical instruments and materials by ensuring the destruction of microorganisms, including bacterial spores. At this temperature, steam under pressure (usually 15 to 30 pounds of pressure) enables the heat to penetrate effectively, which is crucial for thorough sterilization. The process typically requires specific exposure times that correspond to the temperature and the type of materials being sterilized, further assuring that all pathogens are eradicated. The other mentioned temperature ranges are either too low or too high for standard steam sterilization protocols. Lower temperatures might not achieve the necessary conditions to effectively neutralize pathogens, while excessively high temperatures could risk damaging heat-sensitive instruments or materials. Thus, the choice of 270-276°F is aligned with standardized practices in surgical settings for safe and effective sterilization.