01 · Biomedical map
What is cholesterol?
Many people first notice raised lipids on a routine blood test before any symptom. Cholesterol is a waxy building block in cell membranes; your liver makes about 80% and food supplies the rest.
Two lipoproteins carry cholesterol to and from cells. When total cholesterol sits at 6.2 mmol/L and above, the reading is called hypercholesterolaemia. High levels raise the risk of heart disease and stroke.
| Lipoprotein | Role |
|---|---|
| LDL (low-density lipoprotein)Often called “bad” cholesterol in lab language. | Delivers cholesterol to tissues. Strongly linked with fatty build-up in arteries (atherosclerosis), which narrows vessels and raises stroke, heart disease, and peripheral artery disease risk. |
| HDL (high-density lipoprotein)Often called “good” cholesterol in lab language. | Carries excess cholesterol away from the bloodstream back to the liver to be broken down and removed. Higher HDL is associated with lower heart disease risk. |