Normal Renal Dimensions in Iranian Adults Measured by Ultrasound

Correct interpretation of kidney images requires the knowledge of its normal size. This study aimed to establish normal values for kidney length and parenchymal thickness and identify the potential related factors in a group of Iranian adults.
Renal dimensions, including length and parenchymal thickness were measured by sonography in 103 individuals with no renal disease. Statistical analyses were done to find the effect of different variables such as side, age, and gender using 2-tailed t-test, Mann-Whitney test, paired t test, and Wilcoxon-signed rank test. The correlation of renal dimensions with anthropometric parameters, including weight, height, and body mass index (BMI) was analyzed using the Pearson correlation coefficient.
Mean (SD) kidney length was 104.96(6.6) mm for the right, and 106.22(6.16) mm for the left kidney (P=0.02). Mean (SD) parenchymal thickness for the right kidney was 16.9(1.6) mm and on the left side, it was 18.2(1.7) mm (P Because of several factors affecting on kidney size, its assessment should be made individually. The important influencing factors are ethnicity, gender, age, BMI, and height.