Use

Detecting clinically significant lead exposure in 24‑hour specimens. This test is not a substitute for blood lead screening. Measurements of urinary lead (Pb) levels have been used to assess lead exposure. However, urinary lead excretion mainly reflects recent exposure and shares limitations in assessing long‑term exposure or body burden owing to high intra‑individual variability. Urinary lead concentration increases exponentially with blood lead. Interpretation should account for these limitations. Useful context: American College of Medical Toxicology position on post‑chelator urinary metal testing.