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Structure and Function of Leukocytes01:21

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Evaluation of a Point-of-Care Testing Analyzer for Measuring Peripheral Blood Leukocytes
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Race-specific WBC and neutrophil count reference intervals.

E-M Lim1, George Cembrowski, M Cembrowski

  • 1Department of Laboratory Medicine and Pathology, University Hospital, University of Alberta, Edmonton, AB, Canada.

International Journal of Laboratory Hematology
|March 19, 2010
PubMed
Summary

Healthy African Americans have lower white blood cell (WBC) and absolute neutrophil counts (ANC). This study establishes race-specific reference intervals for WBC and ANC, crucial for accurate diagnosis in diverse populations.

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Area of Science:

  • Hematology
  • Clinical Pathology
  • Population Health

Background:

  • Healthy African Americans exhibit lower white blood cell (WBC) and absolute neutrophil counts (ANC) compared to European Americans.
  • Existing reference intervals for WBC and ANC lack consensus and often do not account for ethnic variations.

Purpose of the Study:

  • To establish race-specific reference intervals for WBC and ANC in a diverse US population.
  • To address the discrepancies in current reference intervals that may impact clinical diagnosis and research.

Main Methods:

  • Utilized data from 14,184 participants in the 2000-2003 US National Health and Nutrition Examination Survey (NHANES).
  • Excluded participants based on criteria including low ferritin, pregnancy, high BMI, hypertension, and elevated creatinine or glucose.
  • Analyzed complete blood counts, separating data into six sex/race categories and two age groups (12-18 and >18 years).

Main Results:

  • Established 2.5-97.5 percentile reference intervals for WBC and ANC for non-Hispanic Black males and females across age groups.
  • Demonstrated significantly lower WBC and ANC limits in non-Hispanic Blacks compared to non-Hispanic Whites and Mexican Americans.
  • Provided specific ranges: e.g., adult NHBM: 3.1-9.9 (1.3-6.6) × 10⁹ /l; adult NHBF: 3.4-11 (1.4-7.5) × 10⁹ /l.

Conclusions:

  • Race-specific reference intervals for WBC and ANC are essential due to significant ethnic variations.
  • Current healthcare practices often lack agreement on reference intervals, potentially leading to misdiagnosis.
  • Implementing race-specific intervals is critical for accurate diagnosis and clinical research in populations with significant African ancestry.