{"id":4130,"date":"2021-04-02T18:53:46","date_gmt":"2021-04-02T15:53:46","guid":{"rendered":"https:\/\/medilab.km.ua\/?p=4130"},"modified":"2026-10-14T22:06:27","modified_gmt":"2026-10-14T19:06:27","slug":"antytila-ig-do-s-bilka-covid-19","status":"publish","type":"post","link":"https:\/\/medilab.km.ua\/en\/antytila-ig-do-s-bilka-covid-19\/","title":{"rendered":"IgG antibodies to the S protein of SARS-CoV-2 coronavirus (COVID-19)"},"content":{"rendered":"<h2>What are neutralizing antibodies to COVID-19?<\/h2>\n<p>The COVID-19 neutralizing antibody test helps assess the body&#039;s immune response to the SARS-CoV-2 coronavirus. These antibodies are able to bind to specific parts of the virus and prevent it from entering cells. They can be formed after vaccination against COVID-19 or after a previous coronavirus infection.<\/p>\n<p>The study provides additional information about the humoral immune response. However, the result does not guarantee complete protection against reinfection and should be evaluated taking into account the research method and the clinical situation.<\/p>\n<h2>What does the neutralizing antibody test show?<\/h2>\n<p>After exposure to SARS-CoV-2, the immune system can produce specific antibodies to various proteins on the virus. Of particular importance are antibodies to the S protein (spike protein), which helps the virus enter the body&#039;s cells.<\/p>\n<p>Depending on the laboratory method, the study can help:<\/p>\n<ul>\n<li>to assess the presence of an antibody response after vaccination against COVID-19;<\/li>\n<li>to detect antibodies that may have formed after a coronavirus infection;<\/li>\n<li>determine the level of specific antibodies to the corresponding structures of SARS-CoV-2;<\/li>\n<li>obtain additional information about the body&#039;s humoral immune response.<\/li>\n<\/ul>\n<p>It is important to note that not all S protein antibody tests directly measure their neutralizing activity. <a title=\"Accuracy of laboratory tests: what determines the reliability of the results\" href=\"https:\/\/medilab.km.ua\/en\/the-accuracy-of-laboratory-analyses-is-a-key-factor-in-the-reliability-of-results\/\" data-wpil-monitor-id=\"695\">The exact value of the result depends<\/a> from the test system used by the laboratory.<\/p>\n<h2>Who is recommended to take the test?<\/h2>\n<p>The study may be appropriate on the recommendation of a physician or within the framework of a specific clinical task. It can be used to assess the antibody response after vaccination or previous infection, as well as in scientific research.<\/p>\n<p>However, it is not usually necessary to measure antibodies after each vaccination or to regularly check their levels without specific indications. The result should not be used as the sole basis for making a decision about vaccination or revaccination.<\/p>\n<h2>How are neutralizing antibodies different from other antibodies to COVID-19?<\/h2>\n<p>To assess the immune response to coronavirus, antibodies to different viral proteins can be tested. For example, antibodies to the S protein are directed against the surface structure of the virus, and antibodies to the N protein are directed against the nucleocapsid protein.<\/p>\n<p>Neutralizing antibodies are those that are able to block the virus from infecting cells. Some antibodies to the S protein have this property, but not every antibody detected by the test necessarily neutralizes the virus.<\/p>\n<p>You can read more about other laboratory tests on the page <a href=\"https:\/\/medilab.km.ua\/en\/antitila-covid-19\/\">COVID-19 antibody test<\/a>.<\/p>\n<h2>Does a high level of antibodies provide protection against COVID-19?<\/h2>\n<p>A high level of neutralizing antibodies may indicate a strong humoral immune response, but does not guarantee that a person will not become infected with coronavirus. The effectiveness of protection is influenced by the characteristics of the immune system, the time after vaccination or infection, and the variant of the virus.<\/p>\n<p>Over time, antibody levels may decline, but the immune system may retain memory cells that help the body respond to repeated exposure to the virus.<\/p>\n<p>A negative or low result also does not mean a complete lack of immune protection, as the test does not assess all immune response mechanisms, including cellular immunity.<\/p>\n<h2>How to prepare for the analysis?<\/h2>\n<p>Venous blood is usually used for the test. Before visiting the laboratory, follow the preparation recommendations:<\/p>\n<ul>\n<li>donate blood on an empty stomach, if this is required by the requirements of a specific study;<\/li>\n<li>drink plain still water - this is allowed;<\/li>\n<li>if you are taking other tests at the same time, clarify the rules for preparing for each of them;<\/li>\n<li>Do not cancel medications prescribed by your doctor on your own.<\/li>\n<\/ul>\n<p>If you have any questions about preparation, please check the laboratory requirements before having your blood drawn.<\/p>\n<h2>How to decipher the analysis results?<\/h2>\n<p>The results are evaluated according to the reference limits, units of measurement, and research method specified in the laboratory form.<\/p>\n<p><strong>Positive result.<\/strong> May indicate the presence of antibodies to the relevant structures of SARS-CoV-2. To determine the probable cause of their formation, vaccination history, previous infections, and the type of test are taken into account.<\/p>\n<p><strong>Negative result.<\/strong> Means that antibodies are not detected or their level is below the detection threshold of the test system. This may depend on the time after vaccination or infection, the characteristics of the immune response and the characteristics of the method.<\/p>\n<p><strong>Quantitative result.<\/strong> Reflects the concentration of antibodies or another indicator provided by the method. The numerical values of different test systems cannot always be directly compared with each other.<\/p>\n<p>Do not rely solely on the numerical value to determine your level of protection against COVID-19. If necessary, discuss the result with your doctor.<\/p>\n<h2>When will the results be ready?<\/h2>\n<p>The duration of the study depends on the time of material collection:<\/p>\n<ul>\n<li><strong>Blood collection from 07:00 to 12:00<\/strong> \u2014 results are issued from 4:00 PM to 4:30 PM.<\/li>\n<li><strong>Blood collection from 12:00 to 15:00<\/strong> \u2014 results will be issued from 7:30 p.m. to 8:00 p.m.<\/li>\n<\/ul>\n<p>Before visiting the laboratory, it is recommended to clarify the current schedule for sample collection and results delivery.<\/p>\n<h2>Frequently asked questions about neutralizing antibodies to COVID-19<\/h2>\n<h3>Can I use a test to determine if I have had COVID-19?<\/h3>\n<p>Detection of antibodies may indicate a previous immune response to SARS-CoV-2. However, testing for antibodies to the S protein does not always distinguish between vaccination and past infection. Interpretation should take into account the type of test and vaccination history.<\/p>\n<h3>Is it possible to get sick again if the antibodies are high?<\/h3>\n<p>Yes. Even with the presence of antibodies, reinfection is possible. Their level can affect the likelihood of infection and the course of the disease, but does not provide absolute protection.<\/p>\n<h3>Is it necessary to get vaccinated if antibodies are detected?<\/h3>\n<p>The decision to vaccinate or revaccinate should not be made solely on the basis of the test result. Current vaccination recommendations and individual circumstances should be taken into account.<\/p>\n<h3>What does low antibody levels mean?<\/h3>\n<p>A low score may be due to a decrease in antibody concentration over time or the characteristics of the immune response. However, it does not allow for a full assessment of the body&#039;s defenses, as the study does not measure cellular immunity.<\/p>\n<h3>Do I need to repeat the analysis regularly?<\/h3>\n<p>For most people, routine antibody testing is not necessary. Repeat testing may be appropriate if there is a specific clinical need or a doctor&#039;s recommendation.<\/p>\n<h3>Can antibody levels predict the severity of COVID-19?<\/h3>\n<p>No. This test does not reliably predict the severity of a future infection. The course of the disease is influenced by age, comorbid conditions, characteristics of the virus, and other factors.<\/p>\n<h2>Where can I get tested for neutralizing antibodies to COVID-19?<\/h2>\n<p>At the Medi Lab Plus laboratory, you can undergo a laboratory test according to the available list of tests. Before placing an order, please specify the name of the test, the method of determining antibodies, the preparation rules and the timing of receiving the results.<\/p>\n<p>Laboratory values should be interpreted in the context of the clinical situation. If you have any questions about the result or further action, please contact your doctor.<\/p>\n<p><strong>Importantly:<\/strong> The neutralizing antibody test is an auxiliary method for assessing the immune response and does not confirm the presence of complete protection against COVID-19.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0429\u043e \u0442\u0430\u043a\u0435 \u043d\u0435\u0439\u0442\u0440\u0430\u043b\u0456\u0437\u0443\u044e\u0447\u0456 \u0430\u043d\u0442\u0438\u0442\u0456\u043b\u0430 \u0434\u043e COVID-19? \u0410\u043d\u0430\u043b\u0456\u0437 \u043d\u0430 \u043d\u0435\u0439\u0442\u0440\u0430\u043b\u0456\u0437\u0443\u044e\u0447\u0456 \u0430\u043d\u0442\u0438\u0442\u0456\u043b\u0430 \u0434\u043e COVID-19 \u0434\u043e\u043f\u043e\u043c\u0430\u0433\u0430\u0454 \u043e\u0446\u0456\u043d\u0438\u0442\u0438 \u0456\u043c\u0443\u043d\u043d\u0443 \u0432\u0456\u0434\u043f\u043e\u0432\u0456\u0434\u044c \u043e\u0440\u0433\u0430\u043d\u0456\u0437\u043c\u0443 \u043d\u0430 \u043a\u043e\u0440\u043e\u043d\u0430\u0432\u0456\u0440\u0443\u0441 SARS-CoV-2.<\/p>","protected":false},"author":1,"featured_media":16431,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_flow_reviewer_id":0,"_flow_review_status":""},"categories":[234,233],"tags":[],"class_list":["post-4130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-imunitet-ta-profilaktyka","category-rozshyfrovka-analiziv-ta-pidgotovka"],"_links":{"self":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/4130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/comments?post=4130"}],"version-history":[{"count":0,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/4130\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media\/16431"}],"wp:attachment":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media?parent=4130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/categories?post=4130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/tags?post=4130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}