What is the purpose of integrators in sterilization indicators?

• A. Verify exposure to sterilization parameters.
• B. Indicate only color change.
• C. Verify multiple parameters including exposure.
• D. Show packaging integrity.

Answer: (C)

Integrators are designed to reflect the total exposure the load receives during a sterilization cycle, not just a single momentary condition. They respond to multiple process parameters—temperature, time, and often the activity of the sterilant—so the indicator only changes when the cumulative exposure meets the defined lethality. This provides a more complete assurance that the cycle delivered adequate sterilization for the entire load, rather than merely showing that a target temperature was reached at one point. Simple indicators that only show a color change don’t prove sustained exposure, and packaging integrity is assessed separately.