Urine neutrophil gelatinase associated lipocalin (NGAL) changes with age in patients without kidney disease. Age-associated urine NGAL levels in premature neonates, full-term neonates, children, adolescents, and adults without kidney disease. NGAL levels were obtained from (5,9,23,46). GA, gestational age; IQR, interquartile range; yo, years old.