Sensitivity and specificity of the high fluorescent lymphocyte count-gate on the Sysmex XE-5000 hematology analyzer for detection of peripheral plasma cells

Edwin van Mirre 1 , Gert Jan Vrielink 1 , Nicole Tjon-a-Tsoi 1 , Henriët Hendriks 1 , Wim de Kieviet 1 ,  and Edwin ten Boekel 1
  • 1 Clinical Laboratory, Sint Lucas Andreas Hospital, Amsterdam, The Netherlands

Abstract

Background: Plasma cells are one of the end products of the B-lymphocyte mediated immune response. These cells normally reside in the bone marrow or some peripheral lymphoid tissues. Increased numbers of plasma cells in the blood, usually indicates pathology such as infection, auto-immunity or haematological malignancy. Therefore, the ability to measure plasma cells (PCs) on an automated cell analyzer might be advantageous.

Methods: The performance of the Sysmex XE-5000 leukocyte differential channel [high fluorescent lymphocyte count (HFLC) area] was evaluated for the ability to detect plasma cells in peripheral blood and compared to the detection of plasma cells by flow cytometric analyses.

Results: Our results show that the HFL count from the XE-5000 correlates (R2=0.8) with the number of PCs in peripheral blood, but detects PCs with moderate to good sensitivity (88.9%) and specificity (87.8%).

Conclusions: The Sysmex XE-5000 is suitable for screening blood samples for the presence of elevated number of plasma cells in peripheral blood, but the actual quantification needs to be confirmed by flow cytometry.

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Clinical Chemistry and Laboratory Medicine ( CCLM) publishes articles on novel teaching and training methods applicable to laboratory medicine. CCLM welcomes contributions on the progress in fundamental and applied research and cutting-edge clinical laboratory medicine. It is one of the leading journals in the field, with an impact factor of over three. CCLM is the official journal of nine national clinical societies and associated with EFLM.

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