Abstract
The urea (U) /creatinine (C) ratio was measured in single urine samples. The mean U/C ratios in healthy individuals aged 3 to 7 years and 11 to 12 years were 36.1 for males and 36.0 for females, and 22.1 for males and 19.2 for females, respectively. Those in individuals aged 14 to 15 years, 19 to 23 years, 21 to 60 years, and 61 to 94 years were all between 15 and 18. The U/C ratios in patients aged 59 to 87 years in geriatric wards were 15.3 for males and 16.3 for females. In tube-fed patients supplied with 1, 200 or 2, 400kcal/day, the ratios were below 14 in cases where the amount of absorbed amino acids was less than 42.5g/day, but were above 18 in cases exceeding 52g/day.
