Abstract
In this article the mean values of hemoglobin, red cell volume, and the mean corpuscular hemoglobin concentration in blood of normal school children, are presented for every year of age between 4 and 13 years. From this study it can be seen that there may exist, both for boys and for girls, a period of about 3 years' duration with a constant hemoglobin concentration. It is also found that the mean corpuscular hemoglobin concentration fluctuates with age. Also the mean values of the concentrations of iron, total protein, urea, uric acid, cholesterol, and calcium in serum are presented in relation to the age in years. From this study a tentative conclusion can be made that there may be a relation between the significant changes of both urea and uric acid in blood serum and the appearance of the juvenile or mid-growth spurt.
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