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The investigation determined that lower than expected vitros ammonia (amon) results were obtained from a non-vitros biorad quality control fluid processed using vitros chemistry products amon slides lot 1019-0264-4175 on a vitros 4600 chemistry system.The assignable cause of the lower than expected vitros amon results is an instrument issue related to microslide incubator contamination.Historical quality control results were imprecise.The cause of the microslide incubator contamination is unknown, however, a possible contributor is user error which included using ethanol to clean the vitros 4600 system.An ortho field engineer performed maintenance actions on the vitros 4600 system which included decontamination cleaning of the microslide incubator, replacing the cm/rt evaporation caps, replacing the reflectometer lamp and lens and performing correction factors.Following maintenance actions and a recalibration event, quality control results returned to expectations.
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