Abstract
A method for evaluation of protein intake was devised, involving estimation of the urea/creatinine ratio (U/C ratio) in a single urine sample. The first morning urine sample (taken after 0900h) was found to represent all urine samples taken in a day. The U/C ratios of first urine samples were significantly correlated with protein intake per body weight on the previous day. The U/C ratios of first urine samples from minors were linearly correlated with the logarithmic values of age, height and weight, but the ratios for adults were not correlated with age. Then the U/C ratios of first urine samples from groups of similar ages were determined. Persons whose ratios were beyond the permissible range calculated from the mean value would be examined for excess or deficient protein intake.
