Updated contact office - name/address.Siemens tech ops has completed the investigation: the customer supplied the reagent - multistix 10 sg (7 strips), but no patient samples were received.The strips were visually inspected for abnormalities, none were found.The dessicant was in the bottle as it should be.Using the customers strips, they were dipped into leukocyte esterase release solution - 10 cells/dl and run on the status+.Seven trace leukocyte results were obtained.There were no false negative results observed.The cause of the event is unknown.Per the customer bulletin "causes of leukocyte discrepancies between reagent strip and microscopic method", the cell membranes of leukocytes tend to lyse more readily in urines with lower specific gravity (hypotonic), but they remain intact for longer periods in urines with higher specific gravity (hypertonic).Since the reagent strip reacts with the leukocyte elastase (an esterase) contained within the cell, it is necessary for some of the cells to have lysed in order to be detected with the reagent strip.Therefore, urine samples with higher specific gravities tend to have fewer lysed cells, which would produce fewer positive reagent strip results.Microscopically, the intact leukocytes would still be visible.The cause of the event is unknown.
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