This is a study of the regional variation in Saudi Arabia with respect to the pattern of distribution of total serum cholesterol concentration, low-density lipoprotein (LDL), high-density lipoprotein (HDL), total cholesterol to HDL ratio (CH/HDL) and prevalence of hypercholesterolemia (HC) among Saudi population. It is a cross-sectional national epidemiological randomized household survey. The subjects consisted of 4548 Saudis over the age of 15 years.