Blood Lead Testing: Occupational & Environmental

Occupational testing framework

OSHA lead standard mandates BLL monitoring for employees exposed above action levels: initial baseline, then every 6 months (annual if below 40 µg/dL). Medical removal triggers: BLL ≥60 µg/dL (or average ≥50 on last 3 tests). Return-to-work when BLL <40. Construction and general-industry standards similar.

Adult interpretation bands

• <5 µg/dL: general population baseline
• 5–25: elevated occupational concern; reduce exposure
• 25–50: OSHA surveillance mandatory; health effects possible (hypertension, neuropathy)
• 50–60: removal consideration — significant occupational exposure
• >60: medical removal; chelation discussion
• >100: acute poisoning — encephalopathy, hospitalization

Pediatric lead: no safe threshold

CDC reference value (5 µg/dL) guides public-health intervention — source investigation, environmental remediation, developmental monitoring. Chelation reserved for venous-confirmed ≥45 µg/dL in children. Primary prevention (paint/water/soil management) eliminates exposures far more effectively than testing-into-treatment approaches.

Specimen integrity

Venous draws with proper trace-element collection technique (stainless steel needles, trace-element tubes) essential — capillary fingersticks prone to environmental contamination (false positives). ZPP (zinc protoporphyrin) reflects chronic exposure integrated over months.