|Values are valid only on day of printing.|
Detecting clinically significant lead exposure
Increased urine lead concentration indicates significant lead exposure.
Measurement of urine lead concentration before AND after chelation therapy has been used as an indicator of significant lead exposure. An increase in lead concentration in the postchelation specimen of up to 6 times the concentration in the prechelation specimen is normal. Blood lead is the best clinical correlate of toxicity.
For additional information, see PBBD / Lead with Demographics, Blood.
Reference values apply to all ages.
Urinary excretion of <4 mcg/L is not associated with any significant lead exposure.
Urinary excretion >4 mcg /L is usually associated with pallor, anemia, and other evidence of lead toxicity.
This test is not a substitute for blood lead screening.
High concentrations of gadolinium and iodine are known to interfere with most metals tests. If either gadolinium- or iodine-containing contrast media has been administered, a specimen should not be collected for 96 hours.
1. Kosnett MJ, Wedeen RP, Rotherberg SJ, et al: Recommendations for medical management of adult lead exposure. Environ Health Perspect 2007;115:463-471
2. de Burbane C, Buchet JP, Leroyer A, et al: Renal and neurologic effects of cadmium, lead, mercury, and arsenic in children: evidence of early effects and multiple interactions at environmental exposure levels. Environ Health Perspect 2006;114:584-590
3. Pascal DC, Ting BG, Morrow JC, et al: Trace metals in urine of United States residents: reference range concentrations. Environ Res 1998;76(1):53-59