Blood test to identify antigen-antibody reactions?

The blood test to identify antigen-antibody reactions is called the serological test.

Serological tests are a type of laboratory blood test that measures the presence of antibodies in the blood. Antibodies are proteins that are produced by the immune system in response to infection or vaccination. When an antigen (a foreign substance such as a virus or bacterium) enters the body, the immune system produces antibodies that bind to it and help to destroy it.

Serological tests can be used to diagnose a variety of infections, including:

* HIV

* Hepatitis B

* Hepatitis C

* Syphilis

* Rubella

* Measles

* Mumps

* Chickenpox

Serological tests can also be used to determine a person's immunity to certain diseases. For example, a serological test for measles can be used to determine if a person is immune to measles, even if they have never been vaccinated.

Serological tests are performed by taking a sample of blood from the patient and testing it for the presence of antibodies. The test results can be positive, negative, or equivocal. A positive result means that the patient has antibodies to the antigen in question, which indicates that they have been infected with the disease or vaccinated against it. A negative result means that the patient does not have antibodies to the antigen in question, which indicates that they have not been infected with the disease or vaccinated against it. An equivocal result means that the test results are inconclusive and further testing is needed.

Serological tests are a valuable tool for diagnosing and managing infectious diseases. They are relatively simple to perform and provide accurate results.