The BGW has developed a standard diagnostic procedure for establishing the presence of an infection in persons with cuts or pricks, the so-called general examination programme. The reasoning behind this BGW procedure is a compromise between the scientific, economic and educational aspects. Most important is the medical certainty of the detection or exclusion of virus infections transmissible via the blood. The order of the examinations is derived scientifically from the courses of the three seroconversion processes of illnesses which can be transmitted via blood and from the detectability of their markers.