In addition, genetic disorders such as primary hyperoxaluria, cystinuria, adenine phosphoribosyltransferase (APRT) deficiency, 2,8-dihydroxyadeninuria, and Lesch–Nyhan syndrome can be diagnosed as the cause of recurrent urinary tract stone disease [9]. The gene discussed is APRT; the disease is hyperinsulinemic hypoglycemia, familial, 4.