LDL Cholesterol

What is LDL Cholesterol?

Often called 'bad' cholesterol; high levels are linked to increased cardiovascular risk.

LDL (low-density lipoprotein) cholesterol carries cholesterol from the liver to cells throughout the body. When LDL levels are too high, cholesterol can build up in artery walls, increasing the risk of heart disease and stroke, which is why LDL is a core part of standard cholesterol (lipid panel) testing.

Tests often checked alongside this

• ApoB — counts the actual number of cholesterol-carrying particles
• Lp(a) — an inherited, independent cardiovascular risk marker
• HDL and Triglycerides — completes the full lipid picture

How this can show up in how you look and feel

• LDL cholesterol typically produces no noticeable symptoms on its own
• This is exactly why it's tested rather than felt
• In rare, extreme genetic cases, very high LDL can be associated with visible fatty deposits around the eyelids or tendons, but this is uncommon

What can affect this marker

• Diet, especially saturated fat
• Physical activity levels
• Genetics and family history
• Certain medications and supplements

What to track over time

• Your trend across repeat tests
• Alongside your full lipid panel
• Response to diet or medication changes
• Overall cardiovascular risk factors

What to ask your doctor

• What's my target based on my risk?
• Do I need medication or lifestyle change first?
• Should I retest after changes?
• How does this affect my heart risk?

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.