Table 2 Recommended lab workup for patients with recurrent kidney stone

Serum electrolytes (helps to identify underlying hyperparathyroidism, hyperuricemia and RTA)

Urine composition, two separate 24 h urine collections with patients on their usual diet, fluid intake and physical activity (assess urine volume, calcium, uric acid, citrate, oxalate, creatinine, pH and sodium

Radiography if not yet performed (degree of radiopacity may suggest type of stone present)