COVID-19 Resources

Clinical Laboratory offers COVID-19 Antibody Blood testing on St. Croix.

Clinical Laboratory Inc. is pleased to offer IgG antibody serology testing to indicate SARS-CoV-2 exposure. This test is performed on our Abbott Architect platform, classified by the FDA as a class one Laser Analyzer. In validation tests conducted by the FDA in partnership with NIH, CDC, and BARDA, this test proved to be astoundingly accurate. Sensitivity (PPA) 100% (34/34), Specificity (NPA) 99.0% (99/100).

Patient results are available the same day and can be retrieved confidentially and securely from our patient portal.

Asymptomatic patients will be given an IgG antibody serology test via blood draw. The IgG antibody serology test is one tool that may help identify people who may have been previously exposed to or overcome SARS-CoV-2. It may indicate a prior infection that may be resolved, as well as potential protection against re-infection (“protective immunity”).
Clinical Laboratory Inc. IgG antibody test may be especially useful for people without symptoms, including healthcare workers.

An IgG positive result may suggest an immune response to a primary infection with SARS-CoV-2.
Knowing IgG status helps give individuals and their healthcare provider’s insight for a more informed decision about returning to work and activity.
Antibody serology testing will be performed daily inhouse on our Abbott Architect.

Lab Antibody Testing Procedure

How do I interpret Serology (COVID-19) Antibody (IgG), test results?

A positive (reactive) result indicates detection of SARS-CoV-2 IgG, which may suggest exposure to SARS-CoV-2. It usually takes at least 10 days after symptom onset for IgG to reach detectable levels. Although the relationship between IgG positivity and immunity to SARS-CoV-2 has not yet been established, the detection of IgG antibodies may suggest an immune response to SARS-CoV-2 (COVID-19) after resolution of infection with SARS-CoV-2.

A negative(non-reactive) result indicates that SARS-CoV-2 IgG is not present at a level that is detectable by the SARS-CoV-2 Serology (COVID-19) Antibody (IgG) test. It usually takes at least 10 days after symptom onset for IgG to reach detectable levels. However, the rate of IgG development can vary between individuals, and it is currently not known for how long IgG remains detectable after exposure to SARS-CoV-2. Negative results do not rule out COVID-19 infection, particularly in those who have been in contact with the SARS-CoV-2 virus.

Does a positive result for IgG to SARS-CoV-2 mean that the patient is immune?

Presence of IgG to SARS-CoV-2 indicates that the patient has mounted an immune response to the virus. Although the immune response may protect against reinfection, this has yet to be established. It is also not known how long antibodies to the virus will protect someone, if at all. Scientists are conducting research to answer these questions. Therefore, patients with positive IgG results should continue to take steps to protect themselves and others

What are the indications for use of the SARS-CoV-2 Serology (COVID-19) Antibody (IgG), Immunoassay? Testing for SARS-CoV-2 IgG, including for individuals who may be asymptomatic or are 10 days after SARS-CoV-2 exposure or post-symptom onset, can play a critical role in the fight against COVID-19.