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Background: Renal size is an important indicator in the diagnosis of renal diseases and urinary tract infections in children.Purpose: The purpose of this study is twofold. First, it aimed to measure the renal length and calculate the renal volume of normal Thai children using 2-dimensional ultrasonography (2D-US) and study their correlations with somatic parameters. Second, it aimed to compare the age-specific renal size of normal Thai children with the published data of their Western and Chinese counterparts.Methods: A total of 321 children (150 boys, 171 girls; age, 6–15 years) with a normal renal profile were prospectively recruited. All subjects underwent 2D-US by an experienced pediatric radiologist and the renal length, width, and depth were measured. Renal volume was calculated using the ellipsoid formula as recommended. The data were compared between the left and right kidneys, the sexes, and various somatic parameters. The age-specific renal lengths were compared using a nomogram derived from a Western cohort that is currently referred by many Thailand hospitals, while the renal volumes were compared with the published data of a Chinese cohort.Results: No statistically significant difference ( P  r =0.59) with that of the Western cohort, while the age-specific renal volume was significantly smaller ( P &lt;0.05) than that of the Chinese children.Conclusion: Therefore, we concluded that the age-specific renal length and volume obtained by 2D-US would vary between children in different regions and may not be suitably used as an international standard for diagnosis, although further studies may be needed to confirm our findings.

Sonographic renal length and volume of normal Thai children versus their Chinese and Western counterparts