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New Alert Message Settings for the XN‐series Automated Hematology Analyzer Are Useful for Avoiding Falsely High WBC Counts and to Detect Specimens with Giant Platelets

&NA; We encountered blood specimens from a patient with MYH9 related diseases, which gave falsely high white blood cell (WBC) counts during laboratory analysis using Sysmex XN‐series automated hematology analyzers. This overcount was revealed to be caused by the overlapping of platelet (PLT) distribution with the WBC area in the WNR channel, which was used for routine WBC count with the XN‐series. On the other hand, the WBC count obtained through the WDF channel of the XN‐series seemed more accurate in such a case. We then created and introduced alert message settings for such rare but critical specimens, which gives a warning when the discrepancy in WBC counts between the WNR and WDF channels is higher than 1.0x109/L. By using the alert message setting, we were able to detect some specimens which gave falsely high WBC counts with the routine WNR channel from three other cases of giant PLTs. In conclusion, our alert message setting seems useful in avoiding false reporting of WBC count due to abnormal cells, including giant PLTs.