Explain the Bowie-Dick test and its role in steam sterilization validation.

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The test checks that a prevacuum steam sterilizer properly removes air and allows steam to penetrate a porous load. It uses a standardized test pack with a chemical indicator that responds to steam saturation and vacuum conditions. When the cycle is functioning correctly, the indicator changes in a way that confirms both effective air removal and complete steam penetration throughout the load, indicating the sterilizer is performing as intended. Because this validation is essential for ensuring reliable sterilization, the test is typically performed daily or before the first use of the day. It is not a measure of chemical residues after sterilization, it does not specifically assess the door seal, and it is not used for ethylene oxide sterilization.