Normal kidney size in adults

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Normal kidney size in adults varies with the height of the individual. Also, in general, it decreases with age and increases with body mass index (BMI).

The size of the kidneys is measured mainly sonographically, although both CT and MRI scans also can be used to estimate renal size.

The mean average pole to pole length of an adult human kidney is 10-13 cm. In general, the left kidney is slightly longer than the right.

As expected, solitary kidneys are larger.