Low density lipoprotein
Low-density lipoprotein (LDL) is a lipoprotein that carries cholesterol around the body, for use by various cells.Because LDL transports cholesterol to the arteries, increased levels are associated with atherosclerosis, and thus myocardial infarctions and strokes. This is why cholesterol inside LDL lipoproteins is called bad cholesterol.
LDL is formed as VLDL lipoproteins lose triglyceride, and become smaller and denser containing a higher proportion of cholesterol.
A hereditary form of high LDL is Familial hypercholesterolemia (FH).
Recommended range
The American Heart Association provides a set of guidelines for fasting LDL levels and risk for heart disease.
| Level mg/dl | Level mmol/L | Interpretation |
| <100 | <2.6 | Optimal LDL cholesterol, corresponding to reduced risk for heart disease |
| 100-129 | 2.6-3.3 | Near optimal LDL level |
| 130-159 | 3.3-4.1 | Borderline high LDL level |
| 160-189 | 4.1-4.9 | High LDL level |
| >190 | >4.9 | Very high LDL level, increased risk of heart disease |
See also: cholesterol, high density lipoprotein