LDL Cholesterol
Also known as: LDL, Low-Density Lipoprotein, Bad cholesterol
LDL (low-density lipoprotein) cholesterol is often called “bad” cholesterol. It is one of the particles that carries cholesterol through your bloodstream. When there is more LDL than your body needs, it can build up along the walls of your arteries over time.
Why it's measured
LDL is measured as part of a lipid panel, usually during a routine check-up or when looking at your overall heart and blood-vessel health. Doctors use it alongside your other cholesterol numbers, your history, and your risk factors to get a fuller picture.
Typical range
Many labs flag LDL below 100 mg/dL as optimal for the general population, with higher targets often considered borderline or high. Reference ranges and personal targets vary by lab and by your individual risk profile, so the number on your report is only meaningful in the context your doctor knows.
What high values can mean
A higher LDL result is commonly discussed in terms of long-term cardiovascular risk. It does not, by itself, diagnose any condition. Your doctor weighs it together with blood pressure, family history, lifestyle, and other lab values before drawing any conclusion.
What low values can mean
Lower LDL is generally viewed favorably for heart health. Unusually low values are occasionally noted in certain situations and are worth a brief conversation with your doctor if flagged.
Questions to ask your doctor
- Is my LDL level a concern given my personal risk factors?
- Would you recommend any changes, and how would we track progress?
- How often should I recheck my cholesterol?
- Are there other numbers on my lipid panel we should look at together?
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Try the explainerEducational information only — not medical advice, diagnosis, or treatment. Reference ranges vary by lab; always use your own lab's range and discuss results with a qualified clinician.