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Independent controls add value to qualitative COVID-19 antibody tests.

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    • Abstract:
      The article presents the discussion on controls for qualitative tests monitoring the accuracy and precision at the cutoff or the medical decision point. Topics include qualitative serology test for anti-SARS-CoV-2 looking for antibodies for some piece of the virus's spike glycoprotein; use of independent controls being considered best practice for serology tests; and signaling a change in the sensitivity/specificity of the test.