Fluid Thioglycollate medium w/0.5% Soya lecithin & 4% Polysorbate 20 is used for sterility testing of biologicals and for cultivation of anaerobes, aerobes and microaerophiles. The medium is recommended the media for sterility testing of antibiotics, biologicals and foods and for determining the phenol coefficient and sporicidal effect of disinfectants. However, it is intended for the examination of clear liquid or water soluble materials. It is also routinely used to check the sterility of stored blood in blood banks.