3 doctors weighed in:

Is it possible to pass a six mm kidney stone?

3 doctors weighed in
Dr. Paxton Daniel
Radiology
1 doctor agrees

In brief: Yes

But is also possible that it won't pass.
Study in ajr 2002: the spontaneous passage rate for stones 1 mm in diameter was 87%; for stones 2-4 mm, 76%; for stones 5-7 mm, 60%; for stones 7-9 mm, 48%; and for stones larger than 9 mm, 25%.

In brief: Yes

But is also possible that it won't pass.
Study in ajr 2002: the spontaneous passage rate for stones 1 mm in diameter was 87%; for stones 2-4 mm, 76%; for stones 5-7 mm, 60%; for stones 7-9 mm, 48%; and for stones larger than 9 mm, 25%.
Dr. Paxton Daniel
Dr. Paxton Daniel
Thank

In brief: Maybe

Several factors, mainly stone size and patient anatomy, determine if a stone can pass.
Above ~5mm, the risk rises sharply that a stone gets stuck in the ureter and requiring intervention. But the largest stone i've seen passed was 16mm (!) in a pregnant woman. Bottom line is nobody can predict this with certainty. Stay hydrated and see a urologist, so you have someone to help if/when needed.

In brief: Maybe

Several factors, mainly stone size and patient anatomy, determine if a stone can pass.
Above ~5mm, the risk rises sharply that a stone gets stuck in the ureter and requiring intervention. But the largest stone i've seen passed was 16mm (!) in a pregnant woman. Bottom line is nobody can predict this with certainty. Stay hydrated and see a urologist, so you have someone to help if/when needed.
Dr. Brian Golden
Dr. Brian Golden
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