Which statement about autoclaves is false?

The statement that vacuum autoclaves can sterilize items that have not been decontaminated first is false because all items must be thoroughly cleaned and decontaminated before sterilization to ensure effectiveness. If dirty or contaminated items are placed directly into the autoclave, the sterilization process may not be effective, as microorganisms and soil can shield some pathogens from the effects of steam under pressure.

Other autoclave types, such as downward displacement autoclaves, operate effectively at settings like 134°C or can undergo control tests with TST strips, ensuring their systems are functioning properly. Vacuum autoclaves are designed to effectively sterilize hollow instruments—like syringes or dental handpieces—thanks to their ability to remove air from the sterilization chamber, allowing steam to penetrate and contact all surfaces of the instruments.