Triglycerides 4.2mmol/L is on the high side. The ideal range of triglyceride should be less than 1.7mmol/L, so triglyceride 4.2mmol/L has exceeded the normal range, belongs to the high; Triglyceride elevation can be caused by often eat high-fat food, lack of exercise, obesity and other factors caused by the physiological rise, but also can be seen in high blood fat, atherosclerosis, coronary heart disease and so on caused by the pathologic elevation. People with elevated triglycerides should do a good job of dietary control, avoid eating some high-fat foods, such as animal offal, fat meat, etc., and should also actively engage in physical exercise, and if necessary, can take lipid-lowering drug therapy, such as atorvastatin calcium. Triglyceride 4.2mmol/L is recommended to go to the hospital, ask the doctor to judge and give treatment plan.