High-density lipoprotein cholesterol (HDL-C) is an important indicator in blood lipid tests, with the following clinical significance:
1. Anti-atherosclerosis
HDL-C is known as the “vascular scavenger” as it transports cholesterol from the vascular walls and extrahepatic tissues to the liver for metabolism, reducing cholesterol deposition in the vascular walls, thereby delaying the formation of atherosclerotic plaques and lowering the risk of cardiovascular diseases such as coronary heart disease and myocardial infarction.
Its levels are negatively correlated with the incidence of cardiovascular diseases and serve as a protective factor against coronary heart disease.
2. Antioxidant effect
The antioxidant enzymes in HDL-C particles can inhibit the oxidative modification of low-density lipoprotein (LDL), reducing the damage of oxidized LDL to vascular endothelial cells, lowering inflammatory responses, and further protecting vascular health.
3. Assessing cardiovascular disease risk
HDL-C levels are an important indicator for assessing cardiovascular disease risk.
Low levels of HDL-C (typically <1.0 mmol/L) are associated with diseases such as atherosclerosis, coronary heart disease, diabetes, and chronic renal insufficiency, making it a risk factor for cardiovascular diseases;
while high levels of HDL-C (>2.0 mmol/L) have a protective effect on the cardiovascular system.
4. Assisting in disease diagnosis
Abnormal elevations or reductions in HDL-C may indicate specific diseases:
· Decreased: Commonly seen in coronary heart disease, atherosclerosis, diabetes, liver cirrhosis, chronic renal failure, nephrotic syndrome, etc., and may also be caused by smoking, lack of exercise, or the use of androgen medications.
· Increased: Can be seen in chronic liver disease, primary biliary cholangitis, etc., or due to exercise, alcohol consumption, or estrogen use.
5. Guiding treatment and lifestyle adjustments
Doctors can develop treatment plans based on HDL-C levels, such as dietary adjustments (increasing unsaturated fatty acid intake, reducing saturated fats), regular exercise, quitting smoking, and limiting alcohol to raise HDL-C levels and reduce cardiovascular disease risk.
If HDL-C is too low and lifestyle interventions are ineffective, medication may be necessary.
Precautions:
HDL-C levels are influenced by various factors and should be assessed in conjunction with other blood lipid indicators (such as LDL-C, triglycerides), medical history, symptoms, etc. Testing should be done after fasting for 12 hours, avoiding high-fat diets and intense exercise.