kidney (renal) stones

Q | Which stones may pass without needing treatment?

A | As a rule of thumb, the smaller the stone, the higher the chance of the stone passing. The small table below illustrates your chances of passing a stone of a particular size as a percentage.

  stone size % chance
Upper Urinary Tract Stones
(kidney and upper ureter)

< 5 mm
5-10 mm

29-98%
10-50%
Lower Urinary Tract Stones
(lower ureter and below)

< 5 mm
5-10 mm

71-98%
25-50%