SARS-CoV-2 Nucleocapsid Protein Antigen Qualitative Test (Serum/Plasma)

What This Test Measures

The test looks for antibodies called nucleocapsid-specific immunoglobulins (IgG and IgM) that your body produces in response to the virus. These antibodies are produced after infection and can remain in your system for months or longer. The presence of these antibodies suggests exposure to the virus, though they may not always confirm a past infection if testing too soon after exposure.

How the Test Works

This is a qualitative immunoassay test performed on serum or plasma. It detects antibodies against the nucleocapsid protein of SARS-CoV-2 using a specific probe. The test result is either positive or negative, indicating the presence or absence of these antibodies.

When to Consider This Test

You may need this test if you have had symptoms of COVID-19, have been exposed to someone with COVID-19, or if you are part of a study or surveillance program. It can also be used in certain clinical settings to assess past infection status.

Limitations and Considerations

While this test can indicate past infection, it may not be accurate if taken too soon after exposure. False negatives can occur if testing is done before your body has had time to produce detectable antibodies. Additionally, some people may not develop detectable antibodies even after infection.