Medical data exchange between medicine institutions is very important subject. In Lithuania at this time hasn’t installed united medical system which allows doctors to check patient’s case-history from all hospitals. For example abroad, in Canada for example has united medical system in all country hospitals. Canada hospitals has a lot of different medical data store systems installed, and to exchange data between them, they need to accept one united standard, which allows to get and perceive accepted data in all the country. They accepted to use HL7 standard for medical data exchange. I will try to research, can we use Canada practice in Lithuania, some data and other’s research. Our object to create HL7 system which will send HL7 message answers to HL7 message queries. All queries and answers must follow the requirements of HL7 standard. We will use KMU Heart center database which is in operation for data capture. The fact that database is in operation, adds additional data analysing. Analyzing involves how data met, the HL7 requirements and there they must be put in HL7 message. The data coding in HL7 message is defined in HL7 standard, so this part is clear. But the data exchange and events processing part lets user to take his own decisions. In the analytical part of our work we will try to touch questions about data capture from database and coding it to HL7 message. Also we will touch questions about data exchange methods, what tools or solutions must be used to... [to full text]