What is the role of Western blot in HIV screening during pregnancy?

Updated: Apr 02, 2019
  • Author: Ashley T Peterson, MD; Chief Editor: Ronald M Ramus, MD  more...
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For the Western blot, specific viral proteins are separated by electrophoresis, and reaction of antibody to 3 proteins must occur for the test to be considered positive. Indeterminate results occur when 1 or 2 of the proteins are present. In low-risk populations, indeterminate results usually revert to negative over several months. Western blot has a false-positive rate of 1 in 20,000.

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