A Bowie Dick (BD) test is used to check for proper chamber air removal in vacuum steam sterilizers (commonly referred to as pre-vac or high-vac sterilizers). If the BD test passes, it tells the laboratory that there has been sufficient air removal to achieve required steam penetration into a standard load.
Most hospitals routinely run one Bowie Dick test in each vacuum sterilizer each day. While not absolutely required, it is a good idea that the test be run at the same time each day after the sterilizer is warm. It is important the the test not be run in a cold sterilizer. If a sterilizer has not been used within an hour prior to doing the Bowie Dick test, the chamber should be preheated to operating temperature by running at least one empty chamber cycle. A test run from a cold start may produce false failures. The warm-up cycle will also ensure that any air is cleared out of the lines.
f a Bowie Dick test should fail, another Bowie Dick test should be run as a verification step. If the second test also fails, the sterilizer should be put out of service until the problem is identified and corrected.
Numerous manufacturers throughout the world make and sell BD tests directly to end users and through several distribution channels. Each manufacturer uses the same basic process of placing heat sensitive inks onto the commercial paper in various patterns.
A Bowie Dick test failure is noted by the lack of a total uniform change to the final color as specified by the BD test manufacturer.