The initial reporter stated they have been receiving false positive nitrite results for an unspecified number of patient samples tested using urisys 1100 analyzer serial number (b)(4).The issue started occurring after the urisys 1100 software was updated to version (b)(6).When an affected sample is run on a test strip on the urisys 1100 analyzer, the nitrite result will be positive.When visually reading the same test strip, no color change is visible on the nitrite test pad.The issue occurs with different patient urine samples.The lot number and expiration date of the test strips used on the analyzer were requested, but not provided.
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