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Would the MicroScan instrument ID a VRSA if it were not? For instance, a wound culture from a patient in a nursing home is ID'd as VRSA by the instrument when reading the susceptibility panel. Is it likely to
have been an instrument error? It was not recognized as significant at the time by the tech and there was no follow-up, reset, etc. Eastern USA, Ohio.
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Hi,Great question, I assume this surprise "VRSA" was revealed when you were putting together an antibiogram. It is likely that the VRSA was not correct but a result of panel contamination. Yeast or even a little Pseudomonas, can result in false vancomycin resistance. It is likely that if there had been work to confirm this result, you would have been able to resolve the issue. If you have the Alert rules turned on in LabPro and have implemented LabPro updates, you will find an Alert rule that will flag such resistance in the future. You can add Alert comments to direct the lab staff to reconfirm results, subculture the vancomycin wells (with growth) to blood agar plates to check panel purity, or whatever you think is appropriate. I am sure your CAS or the TAC will gladly help you set up the appropriate Alerts if you are not yet comfortable doing it yourself. I would encourage you to learn the Alert system as you can ensure that the lab as a whole will be guided by actual instructions at the time of an unusual result rather than relying on remembering something that may have been discussed months ago.
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