Question: WHat is anitbody testing for COVID19?

Answer passage (source: CDC):
page_title: Frequently Asked Questions
section_headers: Symptoms & Testing
What is antibody testing? And can I be tested using this method?
section_content: Antibody testing checks a sample of a person’s blood to look for antibodies to
SARS-CoV-2, the virus that causes COVID-19. These antibodies are produced when
someone has been infected, so a positive result from this test indicates that
person was previously infected with the virus.
CDC is working with other federal agencies to evaluate the performance of
commercially manufactured antibody tests that are becoming increasingly
available from healthcare providers. This evaluation is expected to be
completed in early May.
We do not know yet if the antibodies that result from infection with SARS-
CoV-2 can protect someone from reinfection with this virus (immunity) or how
long antibodies to the virus will protect someone. Scientists are conducting
research to answer those questions.
Antibody tests may not be able to tell you if you are currently infected
because it typically takes 1 to 3 weeks to develop antibodies to SARS-CoV-2.
To tell if you are currently infected, you would need a test that identifies
the virus in samples from your upper respiratory system, such as a
nasopharyngeal swab.

Reviewer feedback on this answer:
The answer specifically tells exactly what antibody testing is.
This response is great for what is being asked. It defines antibody tests and then goes further talking about who is doing them and their effectiveness. A very complete answer

Reviewer ratings:
Excellent
Excellent

Answer passage (source: CDC):
page_title: Test for Past Infection
section_headers: How to get an antibody test
section_content: Check with your healthcare provider to see if they offer antibody tests.
If you test positive

A positive test result shows you have antibodies that likely resulted from an infection with SARS-CoV-2, or possibly a related coronavirus.
It’s unclear if those antibodies can provide protection (immunity) against getting infected again. This means that we do not know at this time if antibodies make you immune to the virus.
If you have no symptoms, you likely do not have an active infection and no additional follow-up is needed.
If you have symptoms and meet other guidelines for testing, you would need another type of test called a nucleic acid test, or viral test. This test uses respiratory samples, such as a swab from inside your nose, to confirm COVID-19. An antibody test cannot tell if you are currently sick with COVID-19.
It’s possible you might test positive for antibodies and you might not have or have ever had symptoms of COVID-19. This is known as having an asymptomatic infection, or an infection without symptoms.

If you test negative

If you test negative for COVID-19 antibodies, you probably did not have a previous infection that has gotten better. However, you could have a current infection. It’s possible you could still get sick if you have been exposed to the virus recently, since antibodies don’t show up for 1 to 3 weeks after infection. This means you could still spread the virus.
Some people may take even longer to develop antibodies, and some people may not develop antibodies.
If you have symptoms and meet other guidelines for testing, you would need another type of test called a nucleic acid test, or viral test. This test uses respiratory samples, such as a swab from inside your nose, to confirm COVID-19. An antibody test cannot tell if you are currently sick with COVID-19.


Reviewer feedback on this answer:
This answer talks about antibody testing, but doesn't really say what it is.
This is a pretty good answer. It mostly talks about what the results mean as opposed to what the test itself is but I think the definition is mostly in the response anyway

Reviewer ratings:
Could be Improved
Acceptable

Answer passage (source: CDC):
page_title: Frequently Asked Questions
section_headers: Symptoms & Testing
What kind of test is being used to diagnose if I have COVID-19?
section_content: There are actually many tests being used to diagnose COVID-19 that the U.S.
Food & Drug Administration (FDA) has authorized for use during the current
emergency. All of these viral tests identify the virus in samples from the
respiratory system, such as from nasal or nasopharyngeal swabs. Some tests are
conducted at the testing site you visit, and results are available to you
within minutes. Other tests must be sent to a laboratory to analyze, a process
that takes 1-2 days once the lab receives your samples. Two tests allow you to
collect your own sample at home – either a nasal swabexternal
icon or a
saliva sampleexternal icon – but you will still need to send the
sample to a lab for processing.
Locations and types of testing sites vary depending on where you live (see
question: Where can I get tested). Check with your testing site to learn which
test it uses. You can find a patient information sheet about each test on the
FDA websiteexternal icon.

Reviewer feedback on this answer:
This answer talks about testing in general.  It doesn't really talk about antibody testing or tell what it is.
This doesn't really answer the question, which is just looking for a definition. This talks about where test are conducted and how they do them but not what they actually are

Reviewer ratings:
Could be Improved
Could be Improved