Avtsina test is a method of testing blood for the presence of diseases. This is an important method in medicine for identifying various blood diseases. This test is still used today when it is necessary to determine a person’s blood group, depending on the combination of antigens located on the surface of red blood cells. In addition, the sheep test can also be used to diagnose some specific blood diseases, such as malaria, anemia, leukemia or cirrhosis of the liver. The method itself is as follows: a test tube with pre-prepared blood is divided into two parts. The first is placed in a solution with special antibodies, and the second in a solution with blood. Both samples are then viewed through a microscope and interpreted by specialists. Thus, the sheep test is one of the most reliable diagnostic methods in medicine, which helps prevent common diseases and thereby improve the quality of life of patients.