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Urinary protein excretion in healthy children

, : Urinary protein excretion in healthy children. Clinical Nephrology 12(5): 216-221

The urinary total protein excretion was determined in 270, 18-24 hr urine samples from 130 healthy children of different age groups using the tannic acid-Fe3+-method of Yatzidis [1977]. The daily protein excretion of premature infants in the first month of life varies between 14-60 mg, with a mean of 29 mg, and that of fullterm newborn infants between 15-68 mg, with a mean of 32 mg. Protein excretion increases with age and amounts to 29-238 mg (mean 83 mg) in 10-16 year old children. Thus, the urinary protein concentration during the neonatal period is high when compared to adult values. This explains the "trace" and "positive" reactions frequently obtained in this period of life with Albustix. In 92 urine samples proteins were fractionated by sodium dodecyl sulphate gel discelectrophoresis. Hemoglobinuria was found during the first weeks of life and tubular type proteinuria was found in newborns and infants. The present data suggest that the proteinuria is due to ineffective proximal tubular reabsorption of low molecular weight microproteins as a result of glomerulo-tubular imblance in early life.


PMID: 509796

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