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Considerations in using US-based laboratory toxicity tables to evaluate laboratory toxicities among healthy malawian
Irene R Lubega1, Mary Glenn Fowler, Philippa M Musoke
1Makerere University-Johns Hopkins University Research Collaboration, Kampala, Uganda. ilubega@mujhu.org
Insights
Establishing local infant laboratory norms is crucial. This study found that many healthy Ugandan and Malawian infants showed apparent toxicity based on US standards, highlighting the need for region-specific reference ranges.
Area of Science:
- Pediatric Hematology
- Clinical Chemistry
- Global Health
Background:
- Hematologic and blood chemistry values in infants can vary significantly by geographic location and ethnicity.
- Existing toxicity tables, often based on US populations, may not accurately reflect normal values in African infants.
- Lack of local reference ranges can lead to misinterpretation of laboratory results and potential misdiagnosis.
Purpose of the Study:
- To establish normal hematologic and blood chemistry values for healthy, full-term, non-HIV-exposed infants in Uganda and Malawi.
- To assess the proportion of infants exhibiting apparent laboratory toxicity using Division of AIDS (DAIDS) toxicity tables.
- To inform the development of region-specific pediatric laboratory reference ranges.
Main Methods:
- A cross-sectional laboratory study involving 561 healthy infants aged 0-6 months.
- Blood samples were collected and analyzed for hematologic and chemistry parameters.
- Data were categorized by age and compared against 2004 DAIDS toxicity tables.
Main Results:
- Neutropenia was observed at birth in 20% of Ugandan and 29% of Malawian infants.
- After 7 days, approximately 20% of infants exhibited neutropenia.
- Abnormal hemoglobin levels were noted in 47% of Ugandan and 53% of Malawian infants over 2 months old.
- Blood chemistry findings did not differ significantly from US norms.
Conclusions:
- The study highlights significant differences in hematologic values between African infants and established US-based toxicity tables.
- There is a critical need for developing and implementing local, relevant laboratory norms for infants in Uganda and Malawi.
- Accurate local reference ranges are essential for correct interpretation of infant laboratory results in diverse populations.
Objectives:
To determine normal hematologic and selected blood chemistry values among healthy, full-term, non-HIV-exposed infants in Uganda and Malawi, and to determine the proportion of healthy babies with an apparent laboratory toxicity based on Division of AIDS toxicity tables.
Design:
This was a cross-sectional laboratory study of infants from birth to 6 months of age.
Methods:
Blood samples were collected from a total of 561 infants and analyzed according to age categories similar to those in the 2004 Division of AIDS toxicity tables. Select chemistry and hematology parameters were determined and values compared with those in the toxicity tables.
Results:
In the first 56 days of life, there were few graded toxicities except for neutropenia in 2 of 10 (20%) Ugandan and 13 of 45 (29%) Malawian infants at birth. After 7 days, about 20% of the infants in Uganda and Malawi would have been classified as having a neutropenia whereas 47% and 53% of those more than 2 months of age in Uganda and Malawi respectively, would have been reported as having an abnormal hemoglobin. Chemistry findings were not different from US norms.
Conclusions:
These findings underscore the importance of establishing relevant local laboratory norms for infants.
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