OSMT (Ontario Society of Medical Technologists) Practice Exam

How should instruments be placed in the autoclave for sterilization?

1. Wrapped tightly in muslin

2. Loosely piled in a tray

3. Wrapped loosely in muslin

4. None of the above

The correct answer is: Wrapped loosely in muslin

Instruments should be wrapped loosely in muslin when placed in the autoclave for sterilization to ensure effective steam penetration and contact with all surfaces of the instruments. Loose wrapping allows steam to circulate freely around each item, which is crucial for achieving the necessary temperatures for sterilization and for ensuring that all surfaces are adequately exposed to the sterilizing agent. If instruments are wrapped too tightly, steam cannot reach all surfaces, which can lead to incomplete sterilization and the potential survival of microorganisms. This is why the other options, which either suggest tight wrapping or improper stacking of instruments, could compromise the sterilization process. Therefore, loose wrapping is the best practice for optimal sterilization results.