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Age features of physical and chemical properties of the blood
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Age features of physical and chemical properties of the blood

Newborns and babies of the first year have different features of the blood than adults. So, newborns have higher density and stickiness of the blood, which is determined by higher erythrocytes concentration. Till the end of the first month of life, these features decrease and approach to the one, adults have, or they become lower.

Placental blood circulation and labor complicate interchange of gases. That is why children have acidosis before birth (pH = 7,13 – 7,23). During the first hours (or days) after birth, acidosis gradually disappears.

The concentration of plasma proteins in newborn organism is lower (50 – 56 g/l). It will reach the level of adult in age of 3 – 4 years. The high concentration of ?-globulins is specific for the newborn, which the newborn gets from the mother. Till the end of third month its content decreases, but in future, with the help of its own antibodies formation, it will gradually increase. The concentration of ? and ?-globulins reaches the adult level till the end of the first year of life.

With age, most of the physical and chemical properties of the blood (pH, osmotic pressure, sodium and potassium concentration, viscosity), stay on the same level. Other features can change. So, ECR increases, osmotic resistance of erythrocytes, hematocrit, ablolute and relative albumins concentration decrease.



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