SARS-CoV-2 IgG Antibody Test

The SARS-CoV-2 IgG Antibody Test is a blood test used to detect IgG antibodies against the COVID-19 virus (SARS-CoV-2). It helps determine past infection or immune response after vaccination.

Why is the Test Done?

A doctor may recommend this test for:
✅ Checking past COVID-19 infection
✅ Assessing immunity after vaccination
✅ Detecting asymptomatic infections
✅ Research or epidemiological studies

Types of SARS-CoV-2 Antibody Tests

• IgG Antibody Test: Indicates long-term immunity (past infection or vaccination response).
• IgM Antibody Test: Detects early-stage infection (usually within 1-2 weeks).
• Total Antibody Test: Detects both IgG and IgM.

How is the Test Done?

1. Blood Sample Collection:

   • A blood sample is taken from a vein.
   • Sent to a lab for analysis.

2. Laboratory Analysis:

   • The sample is tested using ELISA (Enzyme-Linked Immunosorbent Assay) or Chemiluminescent Immunoassay (CLIA).
   • Detects IgG antibodies specific to SARS-CoV-2.

Test Results Interpretation

📌 A Positive Result DOES NOT Mean Active Infection

• RT-PCR test (nasal swab) is needed to check for current infection.

Next Steps After the Test

✔️ If IgG Positive:

• You have past exposure or vaccine immunity.
• No special action is needed, but vaccination may still be recommended.

✔️ If IgG Negative:

• If unvaccinated, consider getting vaccinated.
• If recently infected, antibodies may take weeks to develop—retesting later may help.