Antibody screening is a medical test used to detect the presence of antibodies in a person's blood. Antibodies are proteins produced by the immune system in response to infections or vaccinations. This screening helps identify whether someone has been exposed to certain diseases, such as HIV or hepatitis, and can guide further medical decisions. The process typically involves taking a blood sample, which is then analyzed in a laboratory. If antibodies are found, it may indicate past infections or immune responses. This information is crucial for diagnosing conditions, ensuring safe blood transfusions, and monitoring vaccine effectiveness.