Antibody Testing

Appointments are required.

Test results: 24-48 hours, no testing on weekends

Test price: $50-$200

  • Multiple COVID-19 Antibody Test Options:

  • See your body's natural response to COVID-19

  • Positive result indicates an individual has mounted an immune response against the virus due to infection or in response to vaccination

  • Testing may be covered by private insurance, Medicaid, Medicare and other governmental reimbursers with a prescription from a doctor — otherwise, KSL Diagnostics will provide you with a receipt for your test so that you may submit it to your insurance company for possible reimbursement.  

  • For more information on KSL Diagnostics test pricing and policies, see below or call 1-800-960-1080 to speak with a representative.



  • Post-infection/post-vaccine

  • Measure's body's response

  • May indicate protection

Significance of these tests:

Nucleocapsid Protein COVID-19 Total Antibody Test — SARS-CoV-2 total nucleocapsid antibody assay detects total nucleocapsid antibodies to IgM, IgA and IgG in human serum or plasma specimens. The total antibody assay indicates recent or prior infection. It is unknown for how long antibodies persist following infection and if the presence of antibodies confers protective immunity. Antibodies to SARS-CoV-2 are generally detectable in blood several days after initial infection, although the duration of time antibodies are present post-infection is not well characterized. Individuals may have detectable virus present for several weeks following seroconversion.

Spike Protein COVID-19 Antibody Test — Positive results to antibodies against SARS-CoV-2 are generally indicative of an individual’s current or prior infection with the COVID-19 virus, however, the duration of these antibodies remaining in circulation has not yet been established. These test results should always be considered in the context of a patient’s clinical history, physical examination, epidemiologic exposures and vaccination history before making the final diagnosis.

  • IgM isotype antibodies develop within 5 to 7 days and indicates recent infection.

  • IgG isotype antibodies develop after 10 days and remain in circulation longer. It may indicate past infection or vaccine mediated immune response.

  • IgA isotype antibody development is variable in its response and may indicate It may indicate past infection or vaccine mediated immune response.



  • He F, Deng Y, Li W. Coronavirus disease 2019: What we know? Journal of Medical Virology. 2020, Mar 14. doi: 10.1002/jmv.25766

  • Guo L, Ren L, Yang S et al. Profiling Early Humoral Response to Diagnose Novel Coronavirus Disease (COVID-19). Clinical Infectious Disease. 2020, Mar 21, pii: ciaa310. doi: 10.1093/cid/ciaa310

  • Zhao J, Yuan Q, Wang H, et al. Antibody responses to SARS-CoV-2 in patients of novel coronavirus disease 2019. Clinical Infectious

    Disease. 2020, Mar 28, pii: ciaa344. doi: 10.1093/cid/ciaa344

  • Guo, L., Ren, L., Yang, S., Xiao, M., Chang, D., Yang, F., et. al. (2020). Profiling early humoral response to diagnose novel coronavirus disease (COVID-19). Clinical Infectious Diseases.

  • Zheng, Z et al. (2020) Profile of Specific Antibodies to SARS-CoV-2: The First Report Journal of Infection (2020), doi:

  • Long, Q et al. (2020). Antibody responses to SARS-CoV-2 in COVID-19 patients: the perspective application of serological tests in clinical practice. 10.1101/2020.03.18.20038018.