ASTM Quantitative Carrier Tests
(QCT)
Test Purpose
The purpose of microbiology lab
test is to quantify the ability
of a client's product to produce
microbial reduction on hard
environmental surface following
the ASTM Standard Quantitative
Disk Carrier Test Method (ASTM
E2197) to comply with the U.S.
Environmental Protection Agency
(EPA) and other regulatory
agency requirements. This is one
of the microbiology efficacy
tests outlined by EPA to
substantiate hard surface
sporicidal claims against
Clostridium difficile.
Test Summary
A film of bacterial cells dried
on a surface of stainless steel
disk carriers is exposed to the
test substance for a specified
contact time. After exposure,
the carriers are neutralized and
assayed quantitatively for
survivors. Appropriate
viability, carrier population,
and neutralization controls are
performed.
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