The ESR (Erythrocyte Sedimentation Rate) test is a simple and non-specific blood test that measures how quickly red blood cells settle at the bottom of a test tube over the course of one hour. It is used as a general indicator of inflammation or infection in the body, as inflammatory conditions increase certain blood proteins (such as fibrinogen), which cause red blood cells to stick together and settle more rapidly. ESR is often used in the diagnosis or monitoring of inflammatory diseases such as rheumatoid arthritis, lupus, or infections. However, due to its non-specific nature, the results must be interpreted alongside other tests (such as CRP or complete blood count) and clinical symptoms. Other factors like anemia, pregnancy, or aging may also influence the test result, so it is not sufficient alone for a definitive diagnosis.
