Considering only the reference value of HDL, a value of 1.04 mmol/L is at a normal level and does not pose a health risk. HDL is a group of lipoproteins with the highest particle density in the serum, and an increase in its level facilitates the removal of cholesterol from peripheral tissues, thus preventing the occurrence of atherosclerosis. Generally speaking, the reference value of HDL is 1.03~2.07mmol/L, and when it is ≤1.0mmol/L, it indicates a decrease. Therefore, when HDL is 1.04mmol/L, it is in the normal range and there is no need to worry too much. As it is close to the lower limit of the normal value, you can pay attention to a light diet and increase exercise, which will help to improve the HDL level. Generally speaking, low HDL often indicates the presence of atherosclerosis, acute infection, diabetes mellitus, nephrotic syndrome, and the application of androgens and other medications will also be accompanied by a decrease in HDL. And HDL increase has an important role in preventing atherosclerosis and coronary heart disease. To summarize, HDL 1.04mmol/L is normal, but the assessment of health status can not rely solely on this indicator, it is recommended to develop the habit of regular medical checkups, a comprehensive understanding of blood glucose, blood lipids, blood pressure, liver and kidney function and other indicators. If you feel unwell, follow up in the outpatient clinic.