The aim of this analysis was to assess the role of fetal urinary concentrations of neutrophil gelatinase-associated lipocalin (NGAL), β2-microglobulin (B2M) and Cystatin C (CysC) in the prediction of unfavorable outcomes, such as postnatal renal dysfunction and death, among LUTO patients. The gene discussed is CST3; the disease is fetal lower urinary tract obstruction.