Description
This object was used in the cross-matching of blood for blood transfusion. To get a person's blood group, a drop or two of the patient's blood could be mixed with serum of known blood groups in the wells in the tile. These are the Landsteiner A, B and O groups, together with the Rhesus (Rh) serum.
To ensure compatibility in blood transfusion, one or two drops of the patient's blood was mixed with the donor blood. If there was no reaction after a few minutes, it was clear that the bloods were compatible and could be safely transfused. This process was known as 'cross-matching'.