Abstract: Objective To analyze the coincidence of platelet aggregation alarm information of Sysmex XN-1000 blood cell analyzer(hereafter referred to as XN-1000)and explore its treatment method.Methods A total of 123 inpatients with platelet aggregation alarm value >100 in whole blood cell analysis were collected, which were the high value group.123 cases with similar platelet values of age and gender and alarm value of platelet aggregation 0-100 were randomly selected as the low value group.Blood smear was used to determine platelet aggregation and manual platelet count.Results In the high value group, there were 53 positive and 70 negative cases of platelet aggregation, while in the low value group, there were 1 positive and 122 negative cases.The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of platelet aggregation alarm were 98.15%, 63.54%, 43.09%, 99.19% and 71.14%, respectively.Conclusion XN-1000 platelet aggregation alarm information can well screen out platelet aggregation and is not easy to miss diagnosis, but it's accuracy needs to be further verified by manual microscopic examination.

Key words: blood cell analyzer, platelet aggregation, alarm information, alert value