Antibody Test for COVID-19 In Houston - Confirm Results of Vaccine Too

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Antibody Test

Antibody test identifies the stage of COVID-19 infection and proves effectiveness of vaccination. This is a test for those diagnosed with COVID-19. It is also for those who are not sure if they had this infection in the past. As antibodies stay in the blood after recovery from infection, this test helps diagnose a past COVID infection.

The antibodies test is not a diagnostic test; it is used to check an existing infection. This is because the antibodies for COVID-19 take a certain time to develop. Only an antigen test or an RT-PCR test can be used to diagnose this infection during that time.

The antigen test and RT-PCR test are the diagnostic tests for COVID-19. Choose antigen test for rapid diagnosis or RT-PCR test if you can wait longer for results.

Since antibodies are present in the blood, so this test is performed on a blood sample. The antigen test and the RT-PCR test use nasal secretions as the test specimen.

This blog will help you understand in and out about the antibodies test for COVID-19. It is not a diagnostic test; still, it is important for other purposes.

Antibody Test - Purpose

Antibody test finds the stage of your COVID-19 infection. The number of antibodies in the blood decrease with time. This is the basis of the antibody test, as it finds the duration of infection.

  • Antibody test accurately identifies the stage of an active COVID-19 infection.
  • It determines if you had a COVID-19 infection in the past too. This information is useful for knowing whether you have enough antibodies to protect against any further infection.
  • Convalescent plasma therapy to the new patients of COVID-19 uses antibodies from the recovered patients of COVID-19.
  • Antibody test helps in prioritizing individuals for vaccination.
  • It checks the results of the COVID-19 vaccination. It determines whether the vaccination has produced sufficient antibodies in a vaccinated individual.

What are antibodies?

There is an intricate defense mechanism in the human body of which antibodies form a significant part. A special type of white blood cells called B lymphocytes produces antibodies. Antibodies are also known as immunoglobulins. They are protein in nature.

The defense mechanism of the body is called the immune system. The immune system releases antibodies in response to antigens. An antigen is any foreign substance that enters the body and stimulates its immune response. A range of foreign particles is regarded as antigens by the body. Those include toxic substances and disease-causing organisms. An antigen is a molecular structure that is unique to every organism. This forms the basis of the antigen test, as it identifies the distinct antigen molecule distinct of a pathogen. As antibodies develop in response to an antigen, so they are unique for every pathogen.

Antibodies are very specific

The antibodies formed against one virus will not protect against another virus. This is because the body forms unique antibodies for every pathogen. It means that the antibodies for measles will not guard against coronavirus too.

Antibody test requires a prescription

Unlike the diagnostic tests for COVID, you need a prescription from a physician to get the antibody test. This test cannot be ordered at home, as opposed to the antigen test, which can be performed at home. The RT-PCT test and the antigen test are diagnostic tests, and they do not require a prescription from a physician.

The antibody test is very accurate

Antibodies test gives the most accurate results after two weeks of infection. The accuracy of this test increases in the second week. This test has high specificity and sensitivity, so it is very reliable. High specificity means that a positive test result is most likely to be accurate. It also means less chance of any false-negative result.

It is important to know that none of the tests for COVID-19 are completely accurate. However, the antibodies test, the RT-PCT test, and the antigen test are highly accurate tests with a very low likelihood of error or side effects.

Blood versus saliva sample for an antibodies test

Saliva also contains antibodies, so some tests use it as test material for the antibodies test. However, the most effective way is to use blood samples for testing.

What do antibodies do?

Antibodies fight germs or harmful intrusions in the body. The immune system produces unique antibodies in response to every foreign agent. Thus, antibodies can be used to identify the incoming foreign agent in the body. This forms the basis of COVID-19 testing as the test identifies the distinct antibodies formed in response to SARS-CoV-2, the virus that causes COVID-19.

Herd Immunity

The antibody test helps control this pandemic in many ways. According to the WHO, the blood of most of the recovered patients of COVID-19 infection contains antibodies. It finds the number of individuals with herd immunity to estimate the pandemic spread. A person acquires herd immunity after recovering from COVID-19, as antibodies are present in their blood. This means a herd immune person is not susceptible to a fatal secondary infection. This way, they halt the spread of infection.

A herd immune person is less likely to catch COVID again as the antibodies present in the body from the previous infection recognize the incoming virus and help to fight.

However, the duration of herd immunity is still not known. You may catch this infection again, even with antibodies present in the body. This is because the number of antibodies in the body decrease with time.

The period of vaccine immunity is also not known yet. However, it is expected that the new vaccines will protect against the mutated strains of coronavirus too. Also, the antibody treatments may not work against those new strains of this virus.

Still, there is a dire need to treat the existing patients of COVID-19, and the antibodies from recovered patients are useful in treatment. Thus, you serve yourself and your community by getting tested with the antibody test.

Therefore, the antibody test helps to prioritize individuals for vaccination by excluding those who had acquired herd immunity.

Convalescent Plasma (CP) Therapy

The antibodies from recovered patients of COVID-19 are used in convalescent plasma therapy to treat new patients. The blood from donors is first processed to separate the blood cells, leaving behind only the antibodies. This blood having only antibodies is then injected into infected patients. This treatment effectively treats patients with a weak immune system or those in the early stage of the disease.

This therapy reduces the severity or duration of COVID infection. It has proven useful in alleviating COVID symptoms.

CP Therapy Process

In this therapy, the healthcare worker connects a tube to a vein in the arms via a sterile needle. The physician records this plasma therapy to find out further therapies you may need and the duration of your stay in the hospital.

CP therapy treated patients cannot donate plasma

The COVID patients treated with the CP therapy cannot donate their blood for CP therapy of other ill patients.

Do you want to donate your plasma for CP therapy?

The patients who recover from COVID can donate their blood plasma containing antibodies to treat other patients of this infection. However, it is better to donate plasma as soon as possible as the number of antibodies wanes with time.

To donate plasma for CP therapy, you must first find an AABB-accredited site for blood donation. These sites also guide you more about your eligibility as a donor. The FDA further lists the locations where donors can donate CP. The convalescent plasma is used to make hyperimmune globin and for transfusion.

Convalescent plasma therapy is not for all COVID patients

It is worth mentioning that FDA only allows convalescent plasma therapy to selective patients. Moreover, mechanically ventilated patients should not take this therapy. FDA also disallows high-tilter convalescent plasma for patients not on mechanical ventilation.

Antibody test and convalescent plasma therapy are low risks

There aren't any frequent side effects of plasma therapy for COVID-19; the same goes for the antibodies test.

The infrequent side-effects of the plasma therapy include HIV, B and C hepatitis, hemolytic reactions, transfusion-associated circulatory overload, transfusion-related acute lung injury, febrile nonhemolytic reactions, anaphylactic reactions, and allergic reactions.

Reports show how poor management of antibody tests posed a risk to the public.

Antibody Test Process

This test uses a material that contains the antigen of the SARS-CoV-2 virus. This test material is mixed with the blood sample of the patient. If that specimen contains antibodies for the SARS-CoV-2 virus, then they start to fight against the antigen. Consequently, this test generates positive results.

When should you get an antibody test? How long do COVID-19 antibodies last? How long do antibodies stay in your system?

It takes 1-2 weeks for the body to develop antibodies against COVID-19.  The number of antibodies in the body begins to decrease after two months. So, the adequate time for antibodies test is after two weeks of infection.

Antibodies versus cellular immunity for recovery

Not all recovered patients have antibodies in their blood. This means cellular immunity is also a successful alternative defense mechanism against the COVID-19 infection.

Does an antibody test tell if you are immune to secondary infections?

No, presently, the antibody test does not ascertain your immunity to any secondary infection of COVID-19. This means you can catch this infection again after recovering from it.

The availability of this test depends on your location. Visit labwork360.com to get a thorough antibodies test at your nearest lab. The experts in our team make sure to deliver accurate test reports.

Non-compliant antibody test kits placed in the UK markets

Certain shops and boutiques in the UK sell non-compliant antibody test kits. These kits are also available for sale in online stores. The test results obtained by using such test kits are not reliable.

Locate your nearest diagnostic lab at labwork360.com to register an antibody test. Our lab professionally carries out many medical diagnostic tests, including the antibodies test. Our team of experts use proven and hard-tested methods for all the diagnostic tests.

Antibody Test Results

You must continue to practice preventive measures against COVID-19 regardless of your antibodies test and diagnostic test result. There is still a chance of incorrect diagnosis, a false negative, or a false positive. A false negative is more harmful if it makes you stop practicing precautions or seek treatment.

Negative Result

You may test negative in the antibodies test even if infected with COVID. This occurs when the level of antibodies in your blood is too low for diagnosis. Otherwise, a negative antibodies test means you do not have this infection.

Positive Result

A positive result of this infection means you either suffered from this infection before or still have it. The number of antibodies in the blood decrease with time. Also, the amount of antibodies is low at the start of infection. A significant amount of antibodies must be present in the blood for this test to detect them. If their number is below the limit of this test's detection, you will get a false negative result.

Pros of antibody test

  • Convalescent Plasma (CP) therapy treatment
  • Prioritizes individuals for vaccination
  • Identifies the stage of infection
  • Estimates the extent of herd immunity
  • Helps in making better strategies to guard the community and allows freedom of movement
  • Low chance of side-effects
  • Very accurate

However, the purpose of the antibody test is not to allow mobility, such as to decide if a person can start commuting to work or to allow people to socialize. It means that you should carefully observe the measures against COVID-19 to stop the spread of this pandemic.

SARS-CoV-2 variants and the antibody test

The main problem is the increasing number of variants of the SARS-CoV-2 virus. The virus mutates, and the new version carries a different chemical composition. For instance, the new E484K mutation of this virus is in the protein of its spike. Also, these new virus versions trigger a different response from the immune system. Moreover, the structure of the antibodies varies depending on the chemical composition of the incoming foreign substance. This makes the antibodies obtained from recovered patients irrelevant for treating COVID-19 caused by the new strains of the virus.

Antibody Test Near Me

There are many reasons to get an antibody test. It helps physicians to plan their treatment. Moreover, it is also helpful in policymaking to control the spread of this pandemic. Also, it improves safety for you and the community. Visit our website labwork360.com to learn more about our range of diagnostic tests. Labwork has many diagnostic lab centres across the Houston area.

There are many reasons to get an antibody test. It helps physicians to plan their treatment. Moreover, it is also helpful in policymaking to control the spread of this pandemic. Also, it improves safety for you and the community. Visit our website labwork360.com to learn more about our range of diagnostic tests. Labwork has many diagnostic lab centres across the Houston area.

If you’ve had unprotected sex and notice unusual symptoms, you could be infected with a sexually transmitted disease. Even if you don’t have any visible symptoms, it’s possible to have an STD and spread it to another person.

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Questions:

What are antibodies?

What do antibodies do?

Do you want to donate your plasma for CP therapy?

When should you get an antibody test? How long do COVID-19 antibodies last? How long do antibodies stay in your system?

Does an antibody test tell if you are immune to secondary infections?

Answers:

There is an intricate defense mechanism in the human body of which antibodies form a significant part. A special type of white blood cells called B lymphocytes produces antibodies. Antibodies are also known as immunoglobulins. They are protein in nature.

Antibodies fight germs or harmful intrusions in the body. The immune system produces unique antibodies in response to every foreign agent. Thus, antibodies can be used to identify the incoming foreign agent in the body. This forms the basis of COVID-19 testing as the test identifies the distinct antibodies formed in response to SARS-CoV-2, the virus that causes COVID-19.

The patients who recover from COVID can donate their blood plasma containing antibodies to treat other patients of this infection. However, it is better to donate plasma as soon as possible as the number of antibodies wanes with tim

It takes 1-2 weeks for the body to develop antibodies against COVID-19. The number of antibodies in the body begins to decrease after two months. So, the adequate time for antibodies test is after two weeks of infection.

No, presently, the antibody test does not ascertain your immunity to any secondary infection of COVID-19. This means you can catch this infection again after recovering from it.