Treatment of lead poisoning involves the use of a chelating agent.The effectiveness of this treatment is monitored in the laboratory by measuring lead levels in which of the following specimens?

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Treatment of lead poisoning with a chelating agent such as calcium ethylenediamine tetraacetic acid (Ca-EDTA) works by exchanging calcium for lead.Once the chelating agent circulates through the blood stream, it is removed from the circulation by the kidneys and excreted in the urine.Measurement of the amount of lead in the chelate found in the urine demonstrates the effectiveness of the treatment.

Treatment of Lead Poisoning Involves the Use of a Chelating