If they did a urinealysis and found that your urine was clear (your words) then they probably meant that you had no blood in your urine and therefore you did not have a kidney stone. Usually with a kidney stone, although many times you can't see it with your naked eye, there will be blood in your urine. That is probably why they didn't do a Cat Scan, as they felt there wasn't a kidney stone causing your pain and problem.