I've Been Told I Need A Ureteroscopy Which I Thought

I've been told I need a ureteroscopy which I thought was for only one kidney stone (my first one). However, my CT scan today revealed three in the left side (5.5mm, 10mm, and 13mm), plus calculi (1 cm) in the right kidney. Can the doctor work on both sides during the same period of general anesthesia or can he only complete one kidney per procedure?

Never mind ... I didn't realize WebMD.com would charge me.