The Uhlenhuth test, also known as the precipitin test, is a medical test used to determine the presence of specific proteins in a sample of blood or other bodily fluid. It is commonly used to detect the presence of certain antibodies in the blood of individuals who may have been exposed to a particular pathogen or allergen. Synonyms for the Uhlenhuth test include the immunoprecipitation test, the immunodiffusion test, and the immunoelectrophoresis test. These tests all use similar techniques to detect antibodies in bodily fluids and are frequently used in medical research and diagnosis.