The appearance of crystals in the urine. Microscopic examination of the centrifuged sediment helps with the subsequent management of the case. Usually calcium carbonate but often calcium oxalate. Struvite may be seen too. | The appearance of crystals in the urine. Microscopic examination of the centrifuged sediment helps with the subsequent management of the case. Usually calcium carbonate but often calcium oxalate. Struvite may be seen too. |