For many years patients suffering from chronic disease who need a continuous follow-up treatment and whose illness might suddenly become acute again making immediate hospitalization necessary, have been given a card on which their disease is recorded, to be used in case of need. It would be of great importance for a perfect and quick medical help, if not just the kind of disease but a complete hospital file could be recorded on this card, to be used in real time where the patient happens to be. Such cards would be very useful not just in an emergency, but also for the ordinary medical and social welfare, assuring a transmission of information among different health services. Patients suffering from diabetes receive ordinary medical care from general practitioners, while as regards to the diabetes they are often sent for advice or treatment to specialized clinics. Moreover, diabetics must regulary resort to other medical services. Thus an information processing system that allows a quick and complete transmission of the information, however respecting individual peculiarities and medical needs, will certainly improve hospital treatment and might also bring about savings in sanitary costs by avoiding the repetition of useless and expensive check-ups. This aim can be achieved by using and by developing microprocessor-cards. So medical information would circulate and come back again to the starting point after having been used and completed with new data; the information is so improved and becomes more useful. In 1989 an experiment was undertaken in Brescia in order to check the opportunity of using microprocessor-cards for this purpose in diabetological care. The card used for the experiment undertaken in Brescia is based upon the technology of the Smart Card Bull CP8, which has the same size and thickness of a cash-point card with a memory capacity of 64K bits. This card can be recorded and read only by means of suitable equipment provided to all services involved in this experiment. A Diabware computerized hospital file has been created. The most significant administrative and personal data, an exhaustive and remote pathological case history, all the admissions to hospital, the check-up list together with the results, all the remedies normally used, grouped in different sets, can be recorded on the micro-card.