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Hematologic and immunologic parameters in Zimbabwean infants: a case for using local reference intervals to monitor

Stephanie B Troy1, Ali Rowhani-Rahbar, LauraLe Dyner

  • 1Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA 94305-5208, USA. sbtroy@stanford.edu

Journal of Tropical Pediatrics
|April 21, 2011
PubMed

Insights

Laboratory reference intervals for African infants differ significantly from Western standards. This study establishes new Zimbabwean infant reference intervals, highlighting discrepancies in hematologic and immunologic values crucial for pediatric trial safety assessments.

Area of Science:

  • Pediatric Hematology
  • Clinical Immunology
  • Global Health Research

Background:

  • Novel therapy trials in African infants often use Western laboratory reference intervals.
  • Existing research indicates ethnic and geographic variations in hematologic and immunologic reference ranges.
  • This discrepancy can lead to misinterpretation of adverse events in African pediatric populations.

Purpose of the Study:

  • To establish accurate hematologic and immunologic reference intervals for Zimbabwean infants.
  • To assess the impact of using Western reference intervals on identifying adverse events in African infants.
  • To inform the reevaluation of toxicity assessment criteria in pediatric trials in sub-Saharan Africa.

Main Methods:

  • Analysis of 542 blood samples from 269 HIV-uninfected, black, Zimbabwean infants aged 3, 5, and 9 months.
  • Calculation of reference intervals for key hematologic parameters (platelets, hemoglobin, mean corpuscular volume) and immunologic markers (CD4%).
  • Comparison of calculated intervals with established Western reference ranges and adverse event criteria.

Main Results:

  • Significant proportions of Zimbabwean infants had platelet counts (44%), hemoglobin (19%), and mean corpuscular volume (41%) outside Western normal ranges.
  • A majority of hemoglobin values (65%) met US National Institutes of Health Division of AIDS adverse event criteria.
  • A majority of CD4% values (71%) indicated immunodeficiency by World Health Organization criteria.

Conclusions:

  • Established Western hematologic and immunologic reference intervals are inappropriate for evaluating Zimbabwean infants.
  • There is a critical need to reevaluate and adapt reference intervals for pediatric trials in sub-Saharan Africa.
  • Accurate, localized reference intervals are essential for reliable safety monitoring and effective therapeutic interventions in diverse pediatric populations.

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