Urinary stone disease affects up to 15 % of people globally.The etiology of stones may range from nutrition to behavior to genetics.After a first time occurrence of a sympomatic stone, up to 50% of patients may experience another stone within 5 years.Thus, metabolic evaluation for the prevention of stone recurrence can play a major role in reducing the morbidity associated with urinary stones.This session will focus on the means by which we evaluate our nephrolithiasis patients and counsel them based on these results.