Q: What should be the normal size of kidneys for a person having 30 kg weight? Does kidney size (length, width, weight, etc.) vary with age and weight?

A:It has been postulated from autopsy studies that variations in renal dimensions and renal weight are related to gender, with weight being higher in males. It is also known that the left kidney is larger than the right one, independent of gender. A reduction of up to 40% in renal weight occurs over the years, almost entirely because of parenchymal reduction, secondary to reduction in blood supply. The renal dimensions also vary in different ethnic populations.