Until lately the prevalence of heFH was traditionally considered to be ~ 1:500 individuals , although clinical and genetic studies suggest that heFH affects ~ 1:200-250 individuals . Thus, the aim of the Hellenic College of Treatment of Atherosclerosis (HCAT) is to 1). Evaluate the prevalence of FH in Greece (FHG-Registry) and 2). To inform population of FH disease.