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Test Code LAB102 LDL-Cholesterol (Low-Density Lipoprotein), Direct

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Enzymatic/Colorimetric

Note: This test is automatically performed when the Triglyceride in LAB18 Lipid Panel is ≥ 400 mg/dL.

Literature Reference:

Package insert: LDL reagent from Roche. 03/2019.

Specimen Requirements

Patient Preparation:

1. A fasting specimen (12 to 14 hour, overnight) is required if triglycerides or LDL, calculated are ordered along with this test, as triglycerides are affected by recent dietary intake. A fasting specimen is not required if triglycerides or LDL, calculated are not ordered.

2. Patients should be following ordinary eating habits and not be acutely ill, losing weight, pregnant, or had a myocardial infarction within the last 3 months.


Specimen Type: Plasma

Container/Tube: Mint-green top (lithium heparin)

Specimen Volume: Full tube

 

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

83721

Reference Values

Ages ≤ 19 years
  Acceptable:       <110 mg/dL
  Borderline high:  110-129 mg/dL
  High:           >or= 130 mg/dL 


Ages ≥ 20 years
  Optimal:           <100 mg/dL 
  Near optimal:      100-129 mg/dL
  Borderline high:   130-159 mg/dL
  High:              >160 mg/dL

 

Literature Reference:

National cholesterol education program (NCEP) expert panel on detection, evaluation, and treatment of high blood cholesterol in adults (Adult Treatment Panel III). Circulation 2004;110:227.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only
Alternate Tube:

1 dark green-top (lithium heparin) tube
1 red-top tube

 

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed samples are stored refrigerated for five days.

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Cholesterol in LDL 18262-6