Hay Jon
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I'm reading that the quantitative test may not show antibodies, even though you have spike protein antibodies - it looks for natural antibodies from an infection. Not sure quite what to think at this point, but the 'don't worry' articles do not make me more confident.
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Here’s the info on their tests.
https://www.labcorp.com/coronavirus-disease-covid-19/providers/antibody-test