What does the Lead, Urine test measure?

Why is Lead, Urine measured?

Lead is one of the most extensively studied environmental toxicants and has no safe level of exposure. Urinary lead elevation indicates ongoing exposure or mobilisation from soft-tissue stores and is used to monitor occupational exposure, assess recent environmental lead burden, and guide chelation monitoring. Random urine lead underestimates total body burden, as skeletal lead requires provocation (chelation challenge) to mobilise into urine. In functional and integrative medicine, urinary lead is assessed as part of multi-metal toxicant screening in patients presenting with fatigue, cognitive impairment, hypertension, peripheral neuropathy, or developmental concerns in children.

Reference ranges

Standard reference

<2.0 µg/g creatinine # REVIEWER FLAG: Confirm Mosaic Diagnostics reference range for urinary lead. CDC blood lead reference value is 3.5 µg/dL; urinary thresholds differ by specimen type and laboratory. The 2.0 µg/g creatinine threshold is commonly cited for random urine but verify against Mosaic Diagnostics documentation.

Functional medicine optimal

Undetectable to <1.0 µg/g creatinine (functional medicine minimal-exposure target). # REVIEWER FLAG: No established mainstream 'optimal' exists below reference range — reviewer to confirm framing.

Units

µg/g creatinine, µg/L

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.