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Renal size and volume were determined by the ultrasonography in 800 Koreans from the neonates to the aged (307 children and 493 adults, 433 males and 367 females). For the determination of renal volume by the three dimensional measurement of length, width and AP diameter, the true volume of 20 canine kidneys were measured by the water displacement technique, and the value was devided by the product of ultrasonographically measured length × width × AP diameter(mean0.540). These values were correlated with age, height, weight and body surface area. Linear regression of these correlations and coefficients of determinations were calculated, and growth charts of normal size were provided. The results were as follows: 1. The mean±standard deviation of the renal length, width, AP diameter and volume in various age, height, weight and body surface area were determined. 2. In childhood, renal measurements increased proportionally with age, and the regression equation showed excellent coefficient of correlation(R=0.838-0.951). 3. In adult, there was not such a correlation between the renal measurements and age as in childhood. Mean renal length was 10.93±0.68㎝ in male left kidney, 10.65±0.68㎝ in male right kidney, 10.65±0.70㎝ in female left kidney and 10.43±0.71㎝ in female right kidney. Renal volume was 137.94±31.5ml in male left kidney and 123.69±25.8ml in male right kidney, and in female, it was about 15-20ml smaller than male. 4. Renal measurements were correlated with height, weight and body surface area and the linear regression equation showed good correlation between them. 5. Comparison of measured lengths and volumes of both kidneys indicated that length of the left kidney was larger than right in 72.2% of cases and the size discrepancy was less than 1 ㎝ in 66.6%. Volume of the left kidney was larger than right in 72.8% and the discrepancy was less than 30ml in most of the cases.
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