A kidney stone analysis is performed to determine the chemical composition of a stone when it is filtered out of the urine or removed from the urinary tract. A laboratory will typically document the physical characteristics of a stone – its size, shape, weight, color and texture. This is done in order to help identify the cause of the stone and, where possible, to prevent the formation of more stones. The stone may also be fractured so that its layers can be observed. One or more tests will then be performed to determine the stone’s composition. Sample: – – – Reference: – – – Frequency: – – –