What are the minimum sterilization parameters for steam sterilization?

• A. 250°F at 15-20 psi for 30 minutes
• B. 180°F at 10 psi for 20 minutes
• C. 260°F at 25 psi for 15 minutes
• D. 300°F at 20 psi for 60 minutes

Answer: (A)

Moist heat at the right temperature, pressure, and time is needed to reliably kill spores with steam sterilization. The minimum parameter commonly validated for standard loads is a cycle that reaches 121°C (250°F) at 15 psi and runs for 30 minutes, followed by drying. This combination provides enough heat and exposure to penetrate wrapped packs and instrument lumens, ensuring sterility even for the most resistant organisms. Lower temperatures or shorter times won’t reliably achieve sterilization, while higher temperatures or longer cycles aren’t the minimum standard. The other options either miss the required temperature, use an unnecessarily long or short time, or push toward higher temperatures that aren’t the minimum for typical loads.