Which statement best describes the primary purpose of a chemical indicator strip placed inside an instrument package before steam autoclaving?
It changes color when exposed to the correct combination of time, temperature, and steam, confirming that the package experienced an adequate sterilization cycle.
It prints the cycle's pressure and temperature data for the sterilizer log.
It kills highly resistant bacterial spores to prove the load is sterile.
It actively removes air from the chamber to allow steam penetration.
Chemical indicator strips contain heat- and steam-sensitive dyes that irreversibly change color only after they have been exposed to the specific time-temperature-steam conditions necessary for steam sterilization (e.g., 121 °C at 15 psi for the required time). This visual color change verifies that the sterilizing agent has penetrated the package and that the load was subjected to adequate parameters. The strips do not kill microorganisms (that is the role of biological indicators), do not record mechanical data, and do not influence air removal from the chamber.
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