LCN2 and kidney injury: A cohort of 1078 youths of both sexes in the range of 11–18 years of age was recruited.Patients were classified based on sex and age BMI percentiles (LMS method) into five BMI groups (as severely thin, thin, healthy, overweight, and obese), and measurements of urinary biomarkers of kidney injury (KIM-1, NGAL, and ACR) were obtained.