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Covid Antibody Test

Services / Covid Antibody Test


COVID-19 antibody test or serology test measures protective proteins called antibodies in your blood.
Covid 19 antibody test is also used to confirm whether the person has recovered from SARS-CoV-2 or not.

During a viral infection, our immune system produces antibodies, or immunoglobulins, as a response to foreign substances called antigens.
Covid Antibody tests are often done to check whether a person had COVID-19 in the recent past and have developed antibodies against SARS-CoV-2 (Severe acute respiratory syndrome coronavirus2) infection.

Who Should Take a COVID Antibody Test?

You can probably get tested for antibodies if:

  • You’re tested positive for COVID-19 yet completely recovered
  • You assume that you might have come into contact with SARS-CoV-2, but didn’t experience any new symptoms for the past 10 days. The symptoms are difficulty in breathing, loss of taste or smell, dizziness, feeling weak, seizures, diarrhoea, and slurred speech.
  • You’re not experiencing symptoms associated with COVID-19.
  • You didn’t have a fever for the past 24 hours.
covid 19 serology test | City X-Ray

test for covid 19 | City X-Ray

The COVID antibody test may not be right for you if you are:

  • Diagnosed with the virus less than ten days ago
  • Was exposed to SARS-CoV-2 directly in the past 14 days
  • Currently having a disease that weakens your immune system
  • Had a fever during the past 24 hours or feeling sick
  • Want to know whether you’re infected with SARS-CoV-2

Frequently Asked Questions

There are three categories of testing
  • The first one is to identify whether the actual COVID virus genetic material exists, and that's called a NAAT test, N-A-A-T and it's the PCR TESTING where you would have a nasal pharyngeal swab or a pharyngeal swab taken and then they look for the genetic material of the virus itself.
  • The second type of testing is when they try to identify one of the outer proteins of the viral shell or envelope, if you will and that's called ANTIGEN TESTING. So, they try to detect the outer protein of the virus.
  • The third type is to detect within the human body, whether they’ve developed antibodies. So, it looks for antibodies that are specific to the outer portion of the virus itself. So, it shows whether the individual has mounted an immune response or developed immunity towards that specific virus or to COVID and this is COVID ANTIBODY TESTING.
A simple way of understanding the two is –

The ANTIGENS are the proteins that exist on the outer shell of the virus itself. So, it's part of the virus itself.

ANTIBODIES are produced by the human body against those specific antigens
The PCR testing, which is the NAAT testing or that tests the nucleic acid of the virus itself, are the most sensitive ones and to complete the testing process, they need to be done in quite sophisticated laboratory setting and, that's why the turnaround time for these tests can take several days. And, if there's an outbreak and there are lots of samples, it will take several days longer than what we would want to or hope for.

The Antigen Testing that exists now in the market are what we call the Antigen Rapid Diagnostic Tests. They test for the antigen on the outer surface of the virus itself and have been developed in a way that they can be done at the bedside or in the field so they do not need the sophisticated laboratory setting to conduct them.

They are not as accurate as the PCR testing, but they have a very important value as one of the tools to address the COVID pandemic.
There are many studies underway to better understand the antibody response following infection to SARS-CoV-2.
  • Several studies to date show that most people who have been infected with SARS-CoV-2 develop antibodies specific to this virus.
  • However, the levels of these antibodies can vary.
Adequate immune response takes 2-3 weeks after completion of entire vaccination schedule i.e., after the second dose of COVISHIELD and COVAXIN
Along with laboratory testing, chest CT scans may be helpful to diagnose COVID-19 in individuals with a high clinical suspicion of infection.
  • With COVID-19 diagnostic testing, people who test positive and have symptoms can get care earlier.
  • Contacts can be traced and self-isolation or quarantine started sooner to help stop the spread of the virus.
  • But no COVID-19 test is 100% accurate.
  • It's possible to test negative yet actually be infected (false-negative result) or to test positive and not be infected (false-positive result).
  • So it's vital to continue to follow COVID-19 guidelines from the Centers for Disease Control and Prevention, such as social distancing and wearing a mask when appropriate, until further notice.
  • Results of antibody tests indicate how many people had COVID-19 and recovered, including those who didn't have symptoms.
  • This aids in determining who might have immunity, though to what extent and for how long is not yet known.
You can contact your local or state health department or visit the department's website for information on testing. If you have symptoms of COVID-19, contact your doctor to discuss your situation and find out how to prepare for your appointment before seeking a COVID-19 test in person.

If you’re tested positive for COVID-19 antibodies, then it may indicate that you were infected with the virus in the past. This also might mean that you have some immunity to SARS-CoV-2.

  • If your COVID antibody test results are false positive, then it means you have antibodies in your blood and had a different kind of SARS-CoV-2.
  • Whereas, if you test negative, then you didn’t come into contact with the virus, or you didn’t have the virus for a long time, to produce antibodies.
  • It’s possible to test negative, yet have SARS-CoV-2 and not have antibodies. This is a False-negative result.

No matter the test results, you don’t need a follow-up, if you don’t have any symptoms. But in case if you have, then you may need to take a diagnostic test to check for signs of active virus.
Since there are chances of getting false-negative results, after getting tested, it’s essential that you follow safety guidelines. Stay home as much as possible, often wash your hands and wear a mask when you’re out.


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