Direct LDL Cholesterol Test
The Direct LDL test measures LDL cholesterol directly in a serum sample. Quest describes elevated LDL as associated with increased risk for coronary artery disease, even when total cholesterol is otherwise unremarkable.
About this test
LDL, or low-density lipoprotein, is one of the main cholesterol carriers in blood. This test measures LDL cholesterol directly, using an enzymatic method on a serum sample, rather than calculating it from other lipid values.
Quest describes LDL cholesterol as associated with increased risk for coronary artery disease, noting that this association can hold even when total cholesterol levels look otherwise unremarkable, which is part of why LDL is often looked at specifically rather than relying on a total cholesterol number alone.
Test details
| Quest code | 8293 |
|---|---|
| Methodology | Enzymatic |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
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Quest resources
Additional details
What this test looks at
The test reports LDL cholesterol measured directly in a serum sample using an enzymatic method. Quest also lists it under names including DLDL, LDL Cholesterol Direct and LDL Direct.
How it's often used alongside other tests
Direct LDL is described as associated with coronary artery disease risk on its own, and it is commonly considered alongside a broader lipid panel and other cardiovascular markers so a clinician can weigh the full picture rather than one number in isolation.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does the Direct LDL test measure?
It measures LDL cholesterol directly in a serum sample, using an enzymatic method.
How is the sample collected?
The test uses a serum sample from a routine blood draw at a Quest Diagnostics patient service center.
Do I need to prepare for this test?
No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.
How is direct LDL different from calculated LDL?
This test measures LDL cholesterol directly using an enzymatic method, rather than calculating it from other lipid values. Quest lists it separately from a standard lipid panel calculation.
Does a high LDL result mean I have heart disease?
No. Quest describes elevated LDL as associated with increased risk for coronary artery disease, but a single result is read by a clinician alongside other lipid markers, history and risk factors.
What does a LDL Direct test cost without insurance?
$49. Celio Health's price is a flat cash price and insurance is never billed: the required physician's order is included.