The electrolytes - urine test measures specific chemicals called electrolytes in urine. It usually measures the levels of calcium, chloride, potassium, or sodium.
See also:
Bazari H. Approach to the patient with renal disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 115.