I ve been diagnosed with a small calcium stone in my upper right kidney. It causes me no pain, and was discovered by accident on a workup for another problem. But they didn t tell me if it was calcium oxalate or not, and I had a 24 hr. urine to find out if it was calcium or uric acid(not). But isn t it important to know if it is, so I can go on a low-oxalate diet? My doc seemed to be more concerned that I m drinking enough water, which I am. Are calcium based stones always calcium oxalate, or can they just be plain calcium? I eat alot of soy sauce so I d like to know if I need to cut down.