serological marker

A **serological marker** is a specific substance found in the blood that is used to detect or monitor certain diseases or conditions. These markers are typically proteins, antibodies, or antigens that indicate the presence of infection, immune response, or other pathological states. In medical diagnostics, serological markers play a crucial role in identifying infections, autoimmune disorders, and monitoring treatment efficacy. This tag is useful for grouping posts related to blood tests, immunology, disease diagnosis, and related medical research.