Chemical
Indicators are a critical part of an effective quality assurance
program and should be used in conjunction with physical monitoring
and biological indicator testing for verifying the efficacy of a
sterilization system. They range from Class 1 to Class 5 as
briefly described below:
Class 1
is process indicators often referred to as external indicators.
They distinguish between processed or unprocessed items and
indicate that they were exposed the sterilizer. These are seen as
indicators
on pouches, sterilizer tapes or
labels.
Class 2is a chemical indicator
designed for a specific test procedure (e.g. The Bowie-Dick test
used to determine if air removal has been adequate in
dynamic-air-removal sterilizers)
Class 3
is a single parameter indicator. It is designed to react to
one of the critical parameters of sterilization.
Class 4is a multi-parameter
indicator. It is designed to react to two or more of the
critical parameters of sterilization.
Class 5
is an integrating indicator. This chemical indicator reacts toall critical parameters of sterilization which include proper
amount of time, temperature and pressure of steam sterilizers.
They have been correlated to the performance of a biological
indicator when used according to the manufactures conditions noted
on the label.
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Verify the sterilization process of all steam
sterilizers which include Statim, Midmark,
Tuttnauer, Lisa, Mocom and Pelton & Crane
sterilizers.
Bowie-Dick Test
Packs should be used daily to evaluate the
performance of air-removal (vacuum) system of
dynamic pre-vacuum type sterilizers. Available
as test cards or preassembled test packs.
Internal CI’s should be used within
each pouch or package, tray, or container. Class 5
Integrators should be used in conjunction with
physical monitoring and biological indicator
testing for verifying the efficacy of a
sterilization system. (See AAMI ST79:2006)
Recordkeeping is a must for all
sterile processing departments. This ensures
accountability and allows operators to trace
errors to their source. Tips on sterilizer
maintenance and technical advice are included with
each book.