Just as hyperbetalipoproteinemia is the most common kind of familiar hyperlipoproteinemia, hyperprebetalipoproteinemia or increased very low density lipoprotein (VLDL) and its associated hypertriglyceridemia is an abnormality frequently found in association with several metabolic and nutritional disorders. This VLDL abnormality is demonstrable in high percentage of insulin dependent diabetic children before they receive treatment. It is also observed in many older, overweight, insulin resistant diabetic, with poor control of diabetes. An elevation of VLDL was also observed after ethanol intake. A mild to moderate degree of VLDL elevation is the most frequently observed from of clinical hyperlipidemia. Many investigators reported that hyperprebetalipoproteinemia (hypertriglyceridemia) is associated with an increasing incidence of coronary artery disease. As opposed to hyperbetalipoproteinemia, hyperprebetalipoproteinemia is prone to influence on the development of atherosclerosis in the middle and older aged persons which indicates the importance of triglyceride determination in these aged groups. There has been relatively rare study reported on the triglyceride metabolism in patients with congestive heart failure, essential hypertension and liver disease in Korea. This study was designed to determine serum triglyceride, free fatty acid and glycerol in the disease mentioned in Busan University Hospital between jan. 1975 and December 1976 and analized the change of lipid profile in each different condition. The results were as follows; 1. The mean of serum FFA, triglyceride and glycerol in the 37 normal were as follows 502.32+/-146.54microEq/L, 111.84+/-40.53mg% and 432.00+/-212.13microM/ml. 2. 23 patients with congestive heart failure showed a significant reduction in serum triglycerides (91.96+/-27.80mg%) and a significant increase in serum free fatty acid (576.77+/-129.67microEqL) and glycerol (432.50+/-212.13microM/ml). 3. In 15 patients with essential hypertension a significant elevation of serum triglycerides (149.38+/-42.28mg%) was noted. 4. In 13 patients with liver cirrhosis, a reduction in serum triglycerides (80.50+/-34.27mg%) was noted.