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UF-1000i: validation of the body fluid mode for counting cells in body fluids

  • Chérina Fleming , Rob Brouwer , Adriaan van Alphen , Jan Lindemans and Robert de Jonge EMAIL logo
Published/Copyright: June 25, 2014
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Clinical Chemistry and Laboratory Medicine (CCLM)
From the journal Clinical Chemistry and Laboratory Medicine (CCLM) Volume 52 Issue 12

Abstract

Background: We evaluated the new body fluid mode on the UF-1000i urinalysis analyzer for counting total white blood cells (WBC) and red blood cells (RBC) in continuous ambulatory peritoneal dialysis (CAPD), ascites and pleural fluids.

Methods: We collected 154 body fluid samples, and compared the results of the UF-1000i BF mode with the Fuchs-Rosenthal counting chamber and the XN-1000 BF mode. Linearity, carry over and precision were also assessed.

Results: Method comparison results showed acceptable WBC agreement between UF-1000i and chamber (y=1.27x+3.13, n=135, r=0.99) and between UF-1000i and XN (y=1.15x+0.31, n=135, r=1.00). Comparison between the UF-1000i and both comparison methods showed good agreement for RBC counts. Overall results were better when UF-1000i was compared with the XN-1000 than with the Fuchs-Rosenthal chamber. The lower limit of quantitation was defined at 9×106 WBC/L and at 25×106 RBC/L. Linearity for both WBC (r=1.00) and RBC (r=0.99) was good. Carry over was negligible, and it never exceeded 0.01%. In one sample, a high discrepancy was observed between WBC results for both automated analyzers and the counting chamber. This discrepancy was due to interfering factors, such as bacteria and yeast cells, and it led to a false increased WBC count on both automated systems.

Conclusions: The UF-1000i BF mode offers rapid and reliable total WBC and RBC counts for initial screening of CAPD, ascites and pleural fluid, and can improve the workflow in a routine laboratory; however, when using automated analyzers, the inspection of scattergrams is required to ensure the most accurate results are obtained.

Keywords: body fluid; counting chamber; red blood cells (RBC); UF-1000i; white blood cells (WBC)
Corresponding author: Dr. Robert de Jonge, Department of Clinical Chemistry, Na-412 Erasmus MC, University Medical Center Rotterdam, Wytemaweg 80, 3015 CN Rotterdam, The Netherlands, Phone: +31 107033473, Fax: +31 107044895, E-mail:

Acknowledgments

We gratefully acknowledge the help of all members of the Hematology Unit of the Department of Clinical Chemistry.

Conflict of interest statement

Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article.

Research funding: None declared.

Employment or leadership: None declared.

Honorarium: None declared.

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Received: 2014-5-12
Accepted: 2014-6-2
Published Online: 2014-6-25
Published in Print: 2014-12-1

©2014 by De Gruyter

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https://doi.org/10.1515/cclm-2014-0512
Keywords for this article
body fluid; counting chamber; red blood cells (RBC); UF-1000i; white blood cells (WBC)

Articles in the same Issue

  1. Frontmatter
  2. Editorials
  3. CCLM Award for The Most Cited Paper Recently Published
  4. Laboratory preparedness to face infectious outbreaks. Ebola and beyond
  5. Reviews
  6. Determination of reference limits: statistical concepts and tools for sample size calculation
  7. Recent advances in physiological lipoprotein metabolism
  8. New laboratory markers for the management of rheumatoid arthritis patients
  9. General Clinical Chemistry and Laboratory Medicine
  10. The impact of repeat-testing of common chemistry analytes at critical concentrations
  11. Performance of CKD-EPI equation to estimate glomerular filtration rate as compared to MDRD equation in South Brazilian individuals in each stage of renal function
  12. The serum uromodulin level is associated with kidney function
  13. Efficient assessment of peripheral blood lymphocytosis in adults: developing new thresholds for blood smear review by pathologists
  14. Performance evaluation of Sysmex XN hematology analyzer in umbilical cord blood: a comparison study with Sysmex XE-2100
  15. UF-1000i: validation of the body fluid mode for counting cells in body fluids
  16. Newborn screening for haemoglobinopathies by high performance liquid chromatography (HPLC): diagnostic utility of different approaches in resource-poor settings
  17. Progressive chromogenic anti-factor Xa assay and its use in the classification of antithrombin deficiencies
  18. Reference Values and Biological Variations
  19. Thyroid-stimulating hormone reference range and factors affecting it in a nationwide random sample
  20. Reference ranges for serum β-trace protein in neonates and children younger than 1 year of age
  21. A multicenter nationwide reference intervals study for common biochemical analytes in Turkey using Abbott analyzers
  22. Serum reference intervals of homoarginine, ADMA, and SDMA in the Study of Health in Pomerania
  23. Cancer Diagnostics
  24. Low SOX17 expression: prognostic significance in de novo acute myeloid leukemia with normal cytogenetics
  25. Results of first proficiency test for KRAS testing with formalin-fixed, paraffin-embedded cell lines in China
  26. Aberrant hypermethylation of CTNNA1 gene is associated with higher IPSS risk in patients with myelodysplastic syndrome
  27. Cardiovascular Diseases
  28. Association between SNP rs13376333 and rs1131820 in the KCNN3 gene and atrial fibrillation in the Chinese Han population
  29. Acknowledgment
  30. Acknowledgment
  31. Letters to the Editor
  32. Interference in thyroid hormones with Roche immunoassays: an unfinished story
  33. Discrepant results in plasma, but not serum in the Beckman Coulter DxI Access HYPERsensitive hTSH 3rd generation assay affect the management of differentiated thyroid cancer and hyperthyroid patients
  34. Improper serum separation on gel tubes: a trivial laboratory problem or an indicator of monoclonal gammopathy?
  35. Analytical comparison of the new point-of-care troponin T immunoassay on AQT90Flex® analyzer (Radiometer) and the high-sensitivity troponin T immunoassay on ModularE170® (Roche Diagnostics)
  36. Performance characteristics of the enzymatic Abbott Architect HbA1c whole blood assay
  37. Multi-center proficiency tests for Lab-MELD score diagnostics to improve the quality and safety for patients awaiting liver transplantation
  38. The apolipoprotein B/apolipoprotein A-I ratio in healthy men with normolipidemia: limits of variation and relationship with other lipid parameters
  39. Validity and reliability of the 13C-methionine breath test for the detection of moderate hyperhomocysteinemia in Mexican adults; statistical issues in validity and reliability analysis
  40. Enzymatic and endpoint methods yield comparable adenosine deaminase activity in pleural fluid samples
  41. Congress Abstract
  42. 5th Italian GREAT Network Congress
  43. Congress of Laboratory Medicine and Clinical Chemistry
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