Microscopic Appearance of Urine in the Neonatal Period

Abstract
In 95% of specimens of urine from normal newborn infants, less than 10 leukocytes/c.mm. are present, and 98% had less than 10 red blood cells/c.mm. It is suggested that when more than 10 leukocytes or more than 10 red blood cells/c.mm. are found in specimens of urine from newborn infants for two or more days further investigation is warranted. The appearance of these cells on one day only during the first week of life is probably a normal finding.

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