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Population-based hematologic and immunologic reference values for a healthy Ugandan population.

Eric S Lugada1, Jonathan Mermin, Frank Kaharuza

  • 1Center for International Health, University of Bergen, Bergen, Norway. ericlugada@yahoo.com

Clinical and Diagnostic Laboratory Immunology
|January 13, 2004
PubMed
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Hematologic and immunologic reference values in Africa differ from Western populations. New Ugandan-specific reference ranges are needed, especially for CD4+ T-cell counts in children, impacting HIV treatment decisions.

Area of Science:

  • Hematology
  • Immunology
  • Public Health

Background:

  • Current hematologic and immunologic reference values used in Africa may not accurately reflect the local population.
  • Establishing population-specific reference ranges is crucial for accurate medical assessment and treatment decisions.

Purpose of the Study:

  • To evaluate the validity of existing reference values for hematologic and immunologic indices in a large Ugandan cohort.
  • To determine age- and gender-specific reference ranges for these indices in HIV-negative Ugandans.

Main Methods:

  • Analysis of blood samples from 3,311 HIV-negative Ugandans across a wide age range (1 week to 92 years).
  • Assessment of erythrocyte, hemoglobin, hematocrit, mean corpuscular volume, white blood cell counts (neutrophils, lymphocytes, basophils, monocytes), platelet counts, and CD4+/CD8+ T-cell counts.

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  • Statistical analysis to determine age and gender associations with measured parameters.

    • Main Results:

    • Erythrocyte, hemoglobin, and hematocrit levels increased with age and were higher in adult males than females.
    • White blood cell counts and their subsets generally declined with age until 13 years.
    • CD4+ and CD8+ T-cell counts declined with age until 18 years, with higher counts in adult females.
    • Significant differences were observed between Ugandan values and those reported for Western populations, particularly for CD4+ T-cell counts in children.

    Conclusions:

    • Hematologic and immunologic indices in Ugandans show distinct patterns compared to Western populations.
    • Development of African-specific reference values is necessary, especially for CD4+ T-cell counts in children.
    • Discrepancies in CD4+ T-cell counts may affect antiretroviral therapy initiation decisions in HIV-infected children.