average size of kidney stone
Even though 85 percent of kidney stones are small enough to pass during urination, fewer than 50 percent of patients chose this option. A person with a normal-size ureter can usually pass a kidney stone with a diameter less than 5 mm (about 3/16 of an inch) without significant pain or risk of kidney damage.idney stones smaller than 1.5 cubic centimeters (roughly the size of a marble) that are not located in the lower third of the ureter are usually treated with ESWL. ESWL is a noninvasive procedure that uses shock waves to break up the kidney stone in situ (in place).