Serology tests are laboratory analyses that detect and measure the presence of antibodies in the blood. These antibodies are produced by the immune system in response to infections, vaccines, or other foreign substances. By identifying specific antibodies, serology tests can help determine if a person has been exposed to certain pathogens, such as viruses or bacteria, including COVID-19 or HIV. These tests are commonly used in diagnosing diseases, assessing immune status, and conducting epidemiological studies. Results can provide valuable information for healthcare providers, guiding treatment decisions and public health responses. Serology tests are typically performed using blood samples collected from patients.