[Securing the ABO-identity by serafol before blood transfusions (author's transl)].

With the Serafol bedside card the ABO identity can be checked before transfusion in a very quick and simple way. The new bedside card is made from polyester film with a special surface coating indifferent to sera, which absorbs the anti sera to well when it begins to dry, that it contains no intermediatory labile additives. The antisera are applied in four circular areas which are spatially separated from each other and dyed in order to avoid additional labelling mistakes. It is not necessary to dissolve the test sera in water. A drop of the patient's blood and the conserved blood respectively are mixed with the antisera and the result can be read within a minute.