HDL cholesterol level of 1.84mmol/L in human body is generally not serious and falls within the normal range. The normal level of high-density lipoprotein cholesterol (HDL-C) is 1.03~2.07mmol/L. Therefore, HDL-C 1.84mmol/L is a normal value. HDL cholesterol is a lipid test indicator, commonly known as “blood vessel scavenger”. Its role is to transfer lipids from the blood into the liver, and then detoxification. It is a lipoprotein synthesized by the liver that reduces the risk of coronary atherosclerotic heart disease, promotes cholesterol transport in peripheral tissues, and prevents atherosclerosis. It is important to note that a low HDL cholesterol level (less than 1.0 mmol/L) can increase the likelihood of a number of diseases, such as hyperlipidemia, cirrhosis of the liver, chronic hepatitis, hepatocellular carcinoma, chronic renal failure, nephrotic syndrome, and so on. Patients are advised to monitor their HDL cholesterol values in a timely manner and seek medical attention for any abnormalities.