The purpose of this writing is to analyses the doctrine of informed consent. Person exercises his autonomy by making informed and reasonable decisions. The writing attempts to disclose a theoretical and practical role of the informed consent institute and its influence on physician’s civil liability. This work consists of five parts. First of all is given ethical importance of informed consent doctrine. In the following parts of the work it is analyzed national and international regulations on informed consent. There is short Lithuanian case law on informed consent overview. At the end it is concluded that there are some gaps in Lithuanian law concerned with informed consent.