Siemens has completed the investigation: investigational testing was performed on returned lot #004075 (exp 10/31/2021) using three technical operations owned clinitek advantus instruments (s/n (b)(6)).Testing was completed using a wbc negative solution (lot # jgf020321 exp 2/3/22) and a wbc positive 42 cells/ul solution (piwi-00464-msh lot # 0063-05 exp 6/3/21).Four results were obtained per instrument with both the wbc positive and wbc negative solutions.Results: no false negative results were reported.Based on the data collected, the customer report of false negative wbc performance from n-multistix sg-l lot #004075, as reported in gsms pm00264070 was not observed.The cause of this event is unknown.
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