Performance evaluation of the Sysmex haematology XN modular system.

Abstract:

BACKGROUND:The Sysmex XN haematology instrument performs automatic reflex testing, depending on sample results. A nucleated red blood cell (NRBC) count is provided on all samples. The instrument has a smaller footprint (34%) than previous Sysmex XE analysers. METHODS:An evaluation comparing all results to the Sysmex XE-2100 and manual microscopic differential and morphology (n=390) was performed followed by a workflow study of 1000 samples to compare speed of operation and number of blood films reviews required from both systems. RESULTS:The new features on the instrument are: (1) white cell and NRBC channel, all samples include the NRBC count; (2) white cell precursor channel: false positive flags for blasts, abnormal lymphocytes and atypical lymphocytes are reduced significantly without a statistical increase of false negatives; (3) low white cell count mode: suggested setting of <0.5×10(9)/l. An extended count is more precise and provides an accurate differential. Fluorescent platelet count is performed in a dedicated channel. If the red cell or platelet size histograms are abnormal or if the platelet count is low, then a fluorescent platelet count is automatically performed. Good correlation with the XE-2100 and manual differential was found and the improved results compared to the reference flow cytometric analysis for platelet counts, especially below 30×10(9)/l (XE-2100, R(2)=0.500; XN, R(2)=0.875). CONCLUSION:The XN showed reduced sample turnaround time of 10% and reduced number of blood films for examination, 49% less than the XE-2100 without loss of sensitivity with more precise and accurate results on low cell counts.

journal_name

J Clin Pathol

authors

Briggs C,Longair I,Kumar P,Singh D,Machin SJ

doi

10.1136/jclinpath-2012-200930

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

1024-30

issue

11

eissn

0021-9746

issn

1472-4146

pii

jclinpath-2012-200930

journal_volume

65

pub_type

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