Hello, and thanks for your medical question on eHealthForum.
The likelihood that a ureteral stone will pass appears to be determined by its size (i.e., greatest diameter).
As stones increase in size beyond 4 mm, the need for urologic intervention increases exponentially.
Since you have had a earlier stone of 6mm pass out, conservative approach with hydration therapy can be used for 2-3 weeks to allow the stone to move out. About 25 % of stones greater than 5mm usually pass out without any need for any interventions.
Presence of hydronephrosis and a stone of 8.46 mm may need to be monitored very closely and if symptoms remain persistent or increase in severity, or there is worsening of renal functions you may need referral to a urologist and may require additional interventions for stone removal.
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