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HelpTest Code LDL-D LDL Cholesterol, Direct
Useful For
Low-density lipoproteins (LDL) play a key role in causing and influencing the progression of atherosclerosis and coronary sclerosis in particular.
Synonyms/Keywords
Lipoprotein, LDL – Direct, Cholesterol, LDL – Direct, Direct LDL
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
|
Yes 9-12 hours |
Plasma/Serum | Lithium-heparin Plasma Separator (PST), Serum Separator Tube (SST) | Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) | 1 mL | 0.3 mL |
Collection/Processing Instructions
It is recommended that the patient be FASTING 9-12 hours before the specimen is drawn.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Refrigerate | 7 days |
| Frozen | 30 days |
Test Information
The calculated LDL Cholesterol is the routine LDL test. This direct serum test should only be ordered as a secondary test following abnormal lipoprotein panel results where LDL calculation cannot be used.
Interpretations
Desirable LDL-CHOL is ≤ to 100 if Coronary Heart Disease (CHD), Peripheral Vascular Disease, or Diabetes is present.
Desirable LDL-CHOL is < 130 where no CHD is present and there are 2 or more risk factors.
Desirable LDL-CHOL is < 160 where no CHD is present and there are 1 or less risk factors.
Risk factors include: Age (Males > 45; Females > 55); Smoker; High Blood Pressure; Family History of Premature CHD; HDL < 40 (If HDL > 60, subtract one risk factor).
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| Marshfield | ≤19 yrs: 60-110 mg/dL ≥20 yrs: 80-130 mg/dL |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Sunday | Less than 2 hours | Liquid Selective Detergent Endpoint Assay/ Beckman AU |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 83721 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 83721 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Cholesterol Low Density Lipid-Direct |