AST Surgical Technologist Practice Exam

What is the minimum Fahrenheit temperature required for sterilization to occur in a prevacuum steam sterilizer?

1. 250-260 Fahrenheit

2. 270-276 Fahrenheit

3. 280-290 Fahrenheit

4. 300-310 Fahrenheit

The correct answer is: 270-276 Fahrenheit

The minimum Fahrenheit temperature required for sterilization in a prevacuum steam sterilizer is generally recognized to be between 270 and 276 degrees. This temperature range is critical because it ensures that sufficient energy is delivered to kill all microorganisms, including bacterial spores, which are among the most resistant forms of life. At these temperatures, the steam penetrates the items being sterilized effectively, and the vacuum process helps to remove air from the chamber, allowing for proper steam contact with the surfaces of the instruments. The effectiveness of sterilization not only depends on temperature but also on factors like time and the presence of moisture, which is why the prevacuum system is particularly advantageous. Other temperature ranges listed in the choices are higher than necessary for achieving sterilization, which can lead to unnecessary wear on instruments and increased energy costs. Therefore, the correct choice reflects the standard temperature range to ensure effective sterilization while maintaining the integrity of surgical instruments.