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Leukocyte abnormalities

ByPeter Korček

There are significant differences (leukocyte abnormalities) in white blood cell (WBC) total and differential counts between newborns and older children. Alterations in WBC total and differential count can be an early sign of infection (leukopenia, leukocytosis, shift to the left). Total WBC counts should be always adjusted for given postnatal age – see Table.

I/T index = ratio of immature forms (promyelocyte, myelocyte, bands) to mature forms of neutrophil granulocytes (normal ratio < 0.2)

PARAMETERS1 DAY7 DAYS30 DAYS
Leukocyte (x 109/l)9 – 355 – 215 – 19
Neutrophils (%)654535
Lymphocytes (%)304060

References

① Carr R. Neutrophil production and function in newborn infants. Br J Haematol. 2000;110(1):18-28. doi:10.1046/j.1365-2141.2000.01992.x

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