Stock Photo: BLOOD GROUP. BLOOD GROUP Photo essay from laboratory. Determination of blood group ABO on plate. Research of erythrocyte antigens ABO grouping. Here, deposit of anti_A serum blue on the plate. A drop of blood of the patient is placed with serums containing antibodies directed again antigens A blue, B yellow, A et B colorless. An agglutination of red corpuscles then indicates the blood group of the patient. This research erythrocyte antigens ABO grouping must necessarily be validated by the resea