“…24 A study in Poland in 1999 found that lead-exposed children have glomerular and tubular renal dysfunction. 4 Recent study with larger samples in the United States in 2011 concluded that higher BLL was associated with decreased GFR and increased cystatin-C level, and was a risk factor for chronic renal failure. 25 A correlation between lead and cystatin-C, a marker of early renal damage with lead poisoning, has been widely studied, but the study has been limited to adult subjects.…”