What temperature range is typically used for steam sterilization?

• A. 50-60 degrees Celsius
• B. 100-120 degrees Celsius
• C. 121-135 degrees Celsius
• D. 140-160 degrees Celsius

Answer: (C)

The temperature range typically used for steam sterilization is between 121-135 degrees Celsius. This range is optimal for achieving effective sterilization of instruments and materials, as it allows for the destruction of a wide variety of microorganisms, including bacterial spores, which are among the most resistant forms of life.

At these temperatures, steam under pressure is used to create a moist heat environment that facilitates the denaturation of proteins and the disruption of cellular structures, leading to the death of the microorganisms. The most commonly used parameters in steam sterilization protocols are 121 degrees Celsius for at least 15-30 minutes at 15-30 psi of pressure, or 135 degrees Celsius for a shorter duration (around 3-10 minutes), depending on the type of load and the sterilizer being used.

This effective range also takes into account the necessity to ensure the steam is saturated and reaches all surfaces of the instruments, which is essential for successful sterilization. The other temperature ranges listed would not achieve the required lethality for the broad spectrum of pathogens targeted by steam sterilization processes.