Question 1
A surgical team urgently needs a wrapped minor instrument set sterilized. The facility's only available unit is a gravity-displacement steam sterilizer operating at 250°F (121°C). What are the minimum acceptable parameters for this specific cycle?
▸ Why B is the answer
When using a gravity-displacement sterilizer at 250°F for wrapped instruments, the required minimum exposure time is thirty minutes. The physical properties of steam at 250°F naturally generate approximately 15 psi of pressure. Option B correctly identifies these parameters. Option A is incorrect because fifteen minutes is inadequate for wrapped items at this temperature. Options C and D are incorrect because 27 psi is the pressure generated at a much higher temperature, typically 270°F, and would not be seen in a properly functioning 250°F gravity-displacement cycle.
🔑 Key takeaway
Gravity-displacement sterilization of wrapped items at 250°F requires thirty minutes of exposure at fifteen psi.
