In the paper the risks to which the patient is exposed while receiving a medical service have been analyzed. All treatments related to blood collection from the patient deserve much attention. It consists of a number of principles and procedures regarding the patient's health safety as well as safety of a person providing this service. Prevention and preventive actions in the aspect of patient safety in the face of threats resulting from the nature of medical services provided are a priority. Due to preventive action it is possible to avoid the effects of exposure to biological hazards, including the possibility of becoming infected with HIV, HCV and HBV. In the paper the results of a questionnaire survey carried out in selected blood stations of the Śląskie Voivodeship have been presented. The questionnaire is able to collect the information about patient awareness on the risks of the medical service (blood collection).