Asian Journal of Transfusion Science
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Comparative study of quality of leukoreduced packed red blood cell units as assessed by nageotte hemocytometry and flow cytometry

1 Department of Immunohematology and Blood Transfusion, Armed Forces Medical College, Pune, Maharashtra, India
2 Department of Immunohematology and Blood Transfusion, CH(CC), Lucknow, Uttar Pradesh, India
3 Department of Microbiology, Armed Forces Medical College, Pune, Maharashtra, India
4 Department of Transfusion Medicine, Bharati Vidyapeeth University, Pune, Maharashtra, India

Correspondence Address:
Neerja Kushwaha,
Department of Transfusion Medicine CH(CC), Lucknow - 226 002 Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ajts.AJTS_101_21

PURPOSE: Assessment of residual white blood cell (rWBC) count is vital to ascertain the quality of leukodepleted (LD) blood components. Automated cell analyzers lack the sensitivity for the assessment of very few leukocytes as found in LD blood components. Flow Cytometry (FC) based methods and Nageotte hemocytometer are the most commonly used techniques for this purpose. The objective of this study was to compare the use of Nageotte hemocytometer and FC for quality control of LD red blood cell units. MATERIALS AND METHODS: A prospective, observational study was conducted in the Department of Immunohematology and Blood Transfusion of a tertiary care center from September 2018 to September 2020. About 303 LD-packed red blood cell units were tested by FC and Nageotte hemocytometer for rWBCs. RESULTS: The number of rWBC (mean) detected by flow cytometer and Nageotte's hemocytometer was 1.06 ± 0.43 white blood cell (WBC)/μL and 0.67 ± 0.39 WBC/μL, respectively. Coefficient of variation was 58.37% by Nageotte hemocytometer method and 40.46% by FC. Linear regression analysis did not show any correlation (R2 = 0.098, P = 0.001) whereas Pearson's correlation coefficient showed a weak relation (r = 0.31) between the two methods. CONCLUSION: Flow cytometric technique provides a more precise and accurate objective tool compared to Nageotte hemocytometer which is labor intensive, time consuming, and prone to errors arising out of subjectivity along with reported underestimation bias. In the absence of adequate infrastructure, resources, and trained workforce, Nageotte hemocytometer method is a reliable alternative. Nageotte's chamber could be best used in the resource-constrained setup as it offers a relatively inexpensive, simple, and viable means to enumerate rWBCs.

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2006 - Asian Journal of Transfusion Science | Published by Wolters Kluwer - Medknow
Online since 10th November, 2006