Lead is a heavy metal that is mostly found as a compound in the Earth’s crust. The largest use of lead in the present day and age is in batteries of cars.
The reference ranges for lead are as follows:
Normal levels in children: < 10 μg/dL (If screening test at 6 months shows more than 2 μg/dL, repeat testing is warranted in 1 year and exposure prevention strategies should be initiated.)
Normal levels in adult: < 25 μg/dL