PTH and uremia: High serum triglyceride levels can results from frequent heparin use and elevated parathyroid hormone.35 In uremia patients, hypertriglyceridemia can also result from a relative increase in plasma ApoC3 (an inhibitor of lipoprotein lipase) and a relative decrease in plasma ApoC2 (an activator of lipoprotein lipase).8 Our immunoblotting results showed that ApoC3 levels were higher in L5 from HD patients than in any other LDL subfraction.