On (b)(6) 2019, the initial reporter stated they received a positive nitrite value for a proficiency sample when tested with an unknown test strip on a urisys 1100 analyzer.The result for this sample should have been negative.A new test strip tray was sent to the reporter and the reporter was asked to monitor patient values.Over a two month period of time, the reporter observed result discrepancies for six patient samples.Four patient samples had negative nitrite results when tested on the urisys 1100 analyzer, but cultures performed on these samples were positive.Two patient samples had positive nitrite results when tested on the urisys 1100 analyzer, but cultures performed on these samples were negative.
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