ldl (direct low-density lipoprotein cholesterol)
CardiologyBlood sampleResults 24 hrsFasting required
LDL (Direct Low-Density Lipoprotein Cholesterol)
Direct LDL measures the "bad" cholesterol that can build up in artery walls. People get it checked because high LDL is a major risk factor for heart disease and stroke.
Sample
Blood
Results
24 hrs
Fasting
Required
Follow-up
Optional add-on
What this test detects
LDL cholesterol (direct)
Enzymatic colorimetry · serum
Quantitative · mg/dL
When to get this test
Heart and stroke risk
Elevated LDL is strongly associated with the buildup of plaque in arteries.
Guiding cholesterol management
Helps inform decisions about diet, lifestyle, and lipid-lowering treatment.
Monitoring treatment
Tracks whether LDL is reaching target levels during ongoing care.
How to prepare
01
Fast for 9–12 hours before the blood draw; water is allowed.
Common questions
Why is LDL called "bad" cholesterol?
When LDL is high, cholesterol can build up in artery walls and narrow them, raising the risk of heart problems.
What does "direct" LDL mean?
It means the LDL is measured directly in the lab rather than estimated through a calculation.