No show means the absence of the patient from the scheduled appointment without prior notification of the institution where the examination or search appointment has been scheduled. Absenteeism reduce the sustainability of care for individuals, increases waiting times and the accompanying threats to future patient satisfaction. It is a well-known fact that no-shows reduces the productivity and efficiency of service providers, increases healthcare costs and limits the effective capacity of healthcare institutions. The rate of no-shows for examinations or tests affects the functioning of health institutions, and numerous studies have been conducted to analyze the factors and implement methods to reduce the no-show rate to the lowest possible level. In this research, the aim was to determine the rates of non-attendance in 412 subjects (n=412) and patient characteristics associated with missing appointments at the Čakovec County Hospital for two cardiology tests: echocardiography and ergometry. It can be concluded from the research that male patients and patients of the older age group have a higher rate of non-attendance at scheduled examination appointments. It can also be concluded that patients who wait longer for an examination appointment miss scheduled examination appointments more often. The distance of the patient's residence from the place of examination in kilometers was most often missed by the patients of the medium-far group according to distance. It can also be concluded that patients most often miss appointments in health care institutions in the summer months. This research could be used to pay more attention to the study and implementation of methods that will try to reduce the rate of patient no-shows, rationalize certain resources and ensure and increase the quality of health care, all with the aim of preventing the occurrence of diseases, controlling and monitoring already diagnosed diseases and increasing satisfaction of patients and their families.