Testing for Lead Exposure

A recent New York Times article entitledF.D.A. Warns of Faulty Lead Testing in Children and Mothers brought to my attention that blood lead tests taken after 2014 that used Magellan Diagnostics to analyze the blood may be faulty.  The concern is that the tests may have underestimated blood lead levels in tests done by drawing blood from the vein.  There are two ways blood can be drawn for lead tests 1) by pricking the finger or heel (capillary) or 2) drawing blood from the vein.  The tests drawn from the vein that used Magellan Diagnostics seem to be the ones that are providing faulty results.  Although the capillary tests are acceptable it is recommended that if the test shows signs of lead in the blood then the test should be followed up with a venous test. 

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