COVID-19 Test Menu

Our COVID-19 Antibody Tests

ProterixBio offers the following testing services through our high-complexity clinical testing laboratory:


SARS-COV-2 (RBD) IgG Antibody

Semi-quantitative assay that measures antibodies that bind to the Receptor Binding Domain (RBD) of the spike protein of the SARS-CoV-2 virus. The assay output is a numerical value that is related to the levels of antibodies. A cut-off value is used to determine positive and negative.

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SARS-COV-2 (S1) IgG Antibody

Qualitative assay that detects antibodies that bind to the S1 domain of the spike protein of the SARS-CoV-2 virus. Assay output is positive, negative or borderline based on a cut-off.


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Measuring Antibody Levels Allows You to
Better Understand an Individual’s Immune Response


ProterixBio offers testing services that measure levels of antibodies against the receptor binding domain (RBD) of the spike protein of the SARS-CoV-2 virus. We also offer a test that detects antibodies to the S1 domain of the spike protein of the SARS-CoV-2 virus. Antibodies to these antigens are associated with neutralizing activity.

  • SARS-CoV-2 antibody tests are intended for individuals that have had or suspect they have had COVID-19 but are no longer symptomatic. Typically, it takes at least 10 days after the onset of symptoms for IgG levels to be detectable.
  • Individuals interested in obtaining a test should contact their physician.
  • Health care providers, employers or other organizations interested in ProterixBio’s testing services should email or use the contact form below.
  • ProterixBio is a high-complexity clinical testing laboratory (CLIA #22D2189261) located in Billerica, MA.

Contact ProterixBio to Order Today

Please use the form below to request more information about ProterixBio’s COVID Tests:


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