Baird Parker Agar Base (FPT) is recommended for the selective isolation and enumeration of coagulase positive Staphylococci from food and other materials. This medium differs from Baird-Parker Medium in that the egg yolk emulsion has been replaced by fibrinogen, rabbit plasma and trypsin inhibitor. The fibrinogen is added to enhance the coagulase reaction in the medium. The addition of rabbit plasma is found to be more specific for the coagulase activity when compared to other sources of plasma. On this medium Staphylococcal coagulase positive colonies are white to grey-black surrounded by an opaque zone of coagulase activity.