Performance of the Sysmex XN-V hematology analyzer in determining the immature platelet fraction in dogs : A preliminary study and reference values

Josep Pastor Milán, Oriol Jornet-Rius, M. Mesalles-Naranjo

Research output: Contribution to journalArticleResearchpeer-review


Background: Immature platelets (IPs) are newly formed platelets released into circulation that have been demonstrated as good markers of thrombopoiesis. Although many flow cytometric and fully automated-based methods are available, the latest Sysmex XN-V hematology analyzer for veterinary use is equipped with a specific fluorescent platelet channel (PLT-F) that detects platelets using a platelet-specific dye. Objectives: The aims of this study were to evaluate the performance of the Sysmex XSN-1000 V in determining the IPF (immature platelet fraction) and other selected PLT-F channel parameters and to propose IPF reference intervals (RIs) for canine blood samples. Methods: Canine EDTA blood samples were analyzed on the Sysmex XN-1000 V to assess linearity, imprecision, carryover, stability, and the effect of platelet clumping on selected platelet parameters from the PLT-F channel. We also reported the de novo generated RIs for the IPF in dogs. Results: Imprecision was acceptable (CV <10%) for all parameters except for the absolute IPF values (IPF#), in which the reproducibility was 12.15% for the normal-low concentration samples. Linearity and carryover were excellent for all variables. Relative IPF values (IPF %) and IPF# remained stable for both storage conditions for up to 48 hours; however, a nonsignificant progressive increase in these parameters was observed from 12 hours at 4°C. We observed a statistical increase in IPF% and IPF# and a statistically significant decrease in PLT-F counts after intentional in vitro platelet aggregation. RIs were generated for all reference samples (n = 69) and for samples with (n = 25) or without (n = 44) platelet clumps. Conclusions: The performance of the new PLT-F channel-derived variables for dogs was excellent. Specific RIs for IPF should be used when platelet aggregates are present.
Original languageEnglish
Pages (from-to)433-442
Number of pages10
JournalVeterinary Clinical Pathology
Issue number3
Publication statusPublished - Sept 2023


  • Canine
  • Immature platelets
  • Method validation
  • Reticulated platelets
  • method validation
  • immature platelets
  • canine
  • reticulated platelets
  • Reproducibility of Results
  • Hematology
  • Blood Platelets
  • Reference Values
  • Platelet Count/veterinary
  • Animals
  • Dogs


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