Blood serum (lat. serum sanguinis, English. blood serum) is a form of sale of goods in pharmacies made from blood, which is called “living water”, “elixir of life”. In order to obtain high-quality blood serum, the blood should not be venous or arterial. Otherwise, there is a high probability of pathogenic bacteria and viruses entering the body. It is also very important to maintain sterility when taking blood for analysis.