What Is the Biggest Kidney Stone?

Kidney stones can be the size of a pea or — although rare — can grow to the size of a golf ball. The largest kidney stone ever recorded, according to Guinness World Records, was just over 5 inches at its widest point.

What is the largest kidney stone you can pass naturally?

Between 4 mm and 6 mm, only 60 percent will pass without medical intervention, and on average take 45 days to exit your body naturally. Anything bigger than 6 mm will almost always need medical care to help remove the stone.

What size of kidney stone is too big to pass?

In some circumstances, your doctor might recommend immediate surgical removal without a waiting period. This will usually be because the stone is too big to pass naturally (larger than 6 mm) or is blocking urine flow. If the stone is blocking the flow of urine, it can lead to an infection or renal damage.