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Why is an elevated capillary blood lead result confirmed with a venous sample?

April 26, 2017blood capillary elevated lead sample venous

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Why is an elevated capillary blood lead result confirmed with a venous sample?

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A. A Capillary sample collected for a blood lead test is more susceptible to environmental contamination than is a venous sample. An elevated capillary result needs to be confirmed with a venous drawn sample to rule out the possibility of a false positive result.