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DiaMed AG in Switzerland (now marketed under Bio-Rad) have a nice system called VIP which is primarily designed as an aid to antibody identification when using DiaMed panels. However also included are some teaching aids and one is a system where you tick the boxes corresponding to the antibodies already determined in the patient sample, (very useful for patients with multiple antibodies) fill in the box with the number of units requested, then click on the calculate box and the system will then display the number of units you would be required to type from the blood bank to achieve that number of antigen negative units. I think the antigen frequencies used for the calculations will be based on European figures.