In Denmark, health data is registered when you visit your GP, the hospital or a medical specialist, buy medicine at the pharmacy or receive health services in your municipality. This data is collected in national health registers.
The health registers contain information about e.g. diseases, treatments, finances and employees in the healthcare system. Each register has been established to serve a particular purpose, for instance to monitor the development of a disease or the effect of a treatment.
The National Patient Register is the largest register and contains information about all examinations and treatments in Danish hospitals in the last 40 years.