We go through this every year. You either accept it or not,but noone seems to have the lab report you are looking for.
May be you can look at it differently and do the the flushes and Bowel Cleanses for your general health.
I find the answer that I gave you, with the excellent link, should show you that what most people get out are cholesterol or mixed stones. Which are not seen on a ultrasound.
The calcified stones are seen on an US. I have one stone 2.8 cm which must be calcified.
The hundreds of soft stones,I released, were either in my liver or gallbladder and did not show up.
I would advise you to keep reading because this question keeps coming up. May be you can find an answer somewhere through google and let us know.