This is a urine test used to determine whether you have a high level of the chemical oxalate in your urine or not. Oxalate is an end product of your body’s metabolism. This leaves your body through the urine. Increase in oxalate levels can combine together with calcium to form kidney stones. You may need this test if you have kidney stones often. It may be used to determine whether limiting the amount of oxalate in your food is working or not.