The relative renal length by ultrasonography is the ratio of the renal length divided by the patient's body height.
relative renal length =
= (renal length in millimeters) / (body length in centimeters)
Advantages: Reduces differences related to sex and height differences.
Disadvantages: Renal length measurements may be subject to variability.
Data of Miletic et al for healthy adults without renal disease
Observations: The left kidney is slightly larger than the right kidney, with both kidneys becoming smaller with advancing age.
Kidney
Age
Minimum RRL
Maximum RRL
left
18 - 59
0.60
0.74
60 - 69
0.58
0.70
>= 70
0.56
0.66
right
0.57
0.72
0.55
0.68
0.53
0.64
from page 188
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Specialty: Nephrology, Clinical Laboratory
