The neonatal kidney achieves concentrating ability equivalent to adult's kidney by:: (A) One year of age, (B) Eighteen months of age, (C) Three to six months of age, (D) Just before pubey
Answer is A. Answer is A (One year of age) : "Normal adult kidney can produce urine with an osmolalitv of greater than 1000 m Osm/kg water. The healthy new born infant, subject to water deprivation for 10-14 hours can achieve an osmolality of only 500-700 m osm / kg. This value increases gradually during the first few months and approximates to the adult value by about one year of age."