| Studieson NormalValuesforRed Blood Cells
in Korean Children |
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Soon Ki Kim, Byong Kwan Son |
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Department of Pediatrics, Inha Hospital, College of Medicine, Inha University, Seongnam, Korea |
| 소아의 적혈구 정상치에 관한 연구 |
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김순기, 손병관 |
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인하대학교 의과대학 소아과학교실 |
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| Abstract |
Purpose
: Values for hemoglobin, erythrocyte indices and red cell distribution width
used in the diagnosis of anemia and iron deficiency are known to vary to some degree
according to age. We tried to define age-related changes in red blood cells (RBC)
profiles.
Methods
: With the eletronic counters routinely used in clinical laboratories we
evaluated the RBC profiles of 1,717 samples of blood from children who were considered healthy. Mean, median and percentile curves of hemoglobin, hematocrit, red cell indices and red cell distribution width were calculated in children aged 5 months to 15 yr of age.
Results
: The median values for hemoglobin and hematocrit were increased
substantially during childhood. The values of hemoglobin were increased from 11.6g/dl
at 6-11 months, to 12.0g/dl at 2 yr of age, 12.7g/dl at 6-8 yr, reaching a maximum
level of 13.7g/dl at 12-15 yr for males and 13.3g/dl for females, with an average of
13.5g/dl for both sexes. The values of hematocrit were also increased from 34.4% at
6-11 months, 35.5% at 2 yr of age, 37.4% at 6-8 yr and achieved 39.3% for males
and 38.6% for females in adolescence. The MCV at 6-11 months was 76.3 fl; at 2 yr
77.1; and 83.4 fl for males and 84.8 fl for females in adolescence. The increase in MCHz parallels the MCV fairly closely from 25.9 pg at 6-11 months of age to 29.0 pg at adolescence. The MCHC remains conatant throughout infancy and childhood. Cut-off
values(3 percentile) of hemoglobin were 10.7g/dl at 6-11 months, 11 g/dl at 1-2 yr
and 11.5 after 6 yr. Cut-off values (3 percentile) of MCV were 70 fl at 1-2 yr and 75
fl after 6 yr. Correlation between hemoglobin, MCV, MCH and RDW was relatively
significant, but it was much less dependent variables in this reference population than in the children with iron deficiency.
Conclusion
: Our findings indicate that there is a developmental change in red
blood cell size extending beyond the well-recognized changes seen in the first 6 months of life.
Age-related changes in hemoglobin, hematocrit, MCV and MCH must betaken into
consideration in order to optimize the identification of individuals with anemia and iron deficiency. |
| Key Words:
Anemia, Age-related changes, Hemoglobin, Hematocrit, Red cell indices, Red cell distribution width |
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