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Coronavirus antibody test

How can we detect an expired Covid-19 infection?

As of now, we can have a highly specific test for antibodies against corona viruses carried out in our Munich partner laboratory SYNLAB.

The test is performed by taking a blood sample and allows a statement about an infection with the corona virus (SARS-CoV-2).

If the human body comes into contact with the virus, it forms permanent IgG antibodies after about 10 to 14 days. These are detectable in the blood, regardless of whether the person has fallen ill or not.

What does a positive IgG test mean?

If the result is positive, the person tested has 'lived through' the infection. According to current scientific knowledge, this person is then considered 'immune' to the SARS-CoV-2 virus. It is not yetknown how long the immunity will last. However, at this point in time (and in the current state of knowledge), such a result is of importance in various ways for the person tested positive:

  1. He/she is protected in a natural way against a new infection
  2. All close contacts (family members, colleagues, etc.) should also be tested, regardless of whether they have had symptoms or not.
  3. He/she can be considered a Covid-19 recoverer from an epidemiological point of view and is no longer contagious.

Whatdoes a negative IgG test mean?

If the test is 'negative', the coronavirus SARS-CoV-2 has not yet left any permanent 'traces' on the person tested. Either the patient has not yet had contact with this virus or the patient is in the early stages of infection -his body has not yet produced any permanent antibodies.

This means that..:

  1. If the tested person has symptoms, it must be further decided in consultation with the treating physician whether a test for corona viruses (smear test, rapid test) is useful or whether a new antibody test should be repeated after some time.
  2. The person tested negative has no antibodies (yet) and is susceptible to Covid-19 disease. He/she must continue to protect him/herself and others (keep distance, mouth guard, washing hands).

How do we perform the test?

For the test, we need some information from you about the course of the disease so far and contact persons. If you are not ill, we request information on your state of health and previous illnesses. Askfor a consultation appointment. We will then take a blood sample and send it to our laboratory in Munich. A few days later, as soon as we have received the results, we will ask you again for a short consultation in our practice.

If you would like to have yourself or your family member tested, please call us to make an appointment. You will receive further details from our secretary.

Information about the test.

Laboratory information (Dr. Raith, laboratory physician, SYNLAB Munich):

  1. The IgG antibody test is highly specific for SARS-CoV-2 and highly sensitive (over 90% certainty in case of a positive result, 99% certainty in case of a negative result).
  2. 10 days after the first symptoms, antibodies can be detected.
  3. Even with a positive result,precautions for protection should not be completely abandoned.


There are still many unanswered questions in the current SARS-CoV-2 pandemic, especially regarding the covid-19 disease caused by the virus and its subsequent damage. All the information we provide here is based on the current state of medical knowledge. With the great dynamics in all areas of research and therapy, new findings are being made every day. We make every effort to communicate them to our patients in a timely manner.

C/ Maestro Lassalle, 36
28016, Madrid, ESP

Tel. 91 564 38 87 - info_arroba_medicosparati.es