Attempt at passing
For ureteral stones, you may opt for a trial of passage.
Passage rates can be predicted based on stone size, location at presentation and duration of presence. The larger the stone ( > 4-5 mm), the longer it's been trying to pass and the earlier in the ureter it gets stuck all suggest lower likelihood of passage. Some meds aid in passage. Stones in the kidney < 4mm can be watched for growth.