Across roughly 50 U.S. states, blood tests on children show that half had detectable lead levels. What does this mean for public health?
Lead (Pb), atomic number 82, is a malleable, corrosion-resistant metal that's inexpensive but highly toxic to humans, even in small amounts. Recently, we explored a theory linking lead exposure to the fall of the Roman Empire in 476 AD.
A September 27, 2021, study in JAMA Pediatrics analyzed blood tests from 1.14 million children under age six across about 50 states, conducted between October 2018 and February 2020. Results showed more than half had detectable blood lead levels.
Experts from Boston Children's Hospital, the University of Miami's Department of Anesthesiology, Pain Management, and Perioperative Medicine, and Harvey Kaufman, Senior Medical Director at Quest Diagnostics Inc., expressed shock at how widespread lead exposure remains in children.
Context is key: only 2% of children had elevated blood lead levels. For others, levels were low—but experts emphasize there's no safe threshold for lead exposure; zero is the only acceptable level.
In developing children, lead can inflict irreversible harm to the brain and nervous system, leading to lifelong issues with learning, speech, hearing, and behavior. Common sources include drinking water pipes and paint in older homes.
The research also underscores a strong link between lead exposure and poverty. Older, high-risk housing often shelters African-American and Hispanic communities. While progress has curbed pediatric lead poisoning, significant disparities persist at individual and community levels.
