Lead poisoning disproportionately affects children aged 1–5 years living in pre-1978 housing. Lead is a neurotoxin with no safe blood level in children. The developing nervous system is exquisitely sensitive, making permanent cognitive and behavioral effects possible even at low exposures. NCLEX-PN focuses on risk factors, screening, developmental consequences, chelation therapy, and environmental remediation. Primary sources of exposure: - Lead-based paint chips and dust in pre-1978 homes (most common in US) - Contaminated soil near old housing, highways, industrial sites - Lead pipes and soldered joints in drinking water - Imported toys, jewelry, pottery with lead-containing glazes - Occupation-related exposure (parents who work in construction, auto repair, battery manufacturing) On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the...