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Test Name

Direct LDL

CPT Code(s)

83721

Methodology

Enzymatic

Reference Range(s)

<20 Years <110 mg/dL
≥20 Years   <130 mg/dL
Desirable range <100 mg/dL for patients with CHD or diabetes and <70 mg/dL for diabetic patients with known heart disease.

Clinical Significance

LDL cholesterol is a key factor in the pathogenesis of atherosclerosis and Coronary Artery Disease (CAD), while HDL cholesterol has often been observed to have a protective effect. Even within the normal range of total cholesterol concentrations, an increase in LDL cholesterol can produce an associated increased risk for CAD. LDL cholesterol binds to receptor sites on macrophages in blood vessel walls inciting several changes to the blood wall which enhance atherosclerotic plaque development.

Alternative Name(s)

Low Density Lipoprotein, Cholesterol, LDL, LDL Cholesterol, Direct

To view specimen requirements and codes please Select a regional laboratory.

Not sure which laboratory serves your office? Call us 866-MYQUEST (866-697-8378)

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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Direct LDL
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