Test Name

LDL-Cholesterol
(Calculated)

Test Code

219

Unit

mg/dL

Station

Chemistry

Synonym Name/Abbreviation

LDL-C, Low Density Lipoprotein Cholesterol, Friedewald
Formula

CPT Code

83721

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Calculation

AML Preferred Tube

5 mL SST gel

Storage Instructions

Refrigerated.

Separate serum from cells within 45 minutes;

Stability:

12 month -20⁰C
12 month -70⁰C

Min. Volume

1 mL

Comments

LDL-C is the method currently recommended by the NCEP for
routine use.

Turn-Around-Time

One day

Intended Use

Cardiac risk marker in conjunction with other lipid
measurements.

Limitations

Affected by high tryglicerides result; abnormal liver
function affects lipid metabolism, making HDL & LDL results of limited
diagnostic value.  Many drugs
affect LDL-C. Low-density lipoprotein cholesterol (LDLC) cannot be
calculated if triglyceride is <400 mg/dL.

Measuring range: 3.87-549 mg/dl.

Patient Preparation

Patient should be fasting for 12-14 hours prior to
collection.(Fasting is not important for cholesterol analysis but for
determining other lipids, eg triglycerides when testing lipids
profile).

Reasons for Rejection

Specimen with greatly elevated triglycerides (>400 mg/dL);
improper specimen labeling

Adult Reference Ranges

Desirable: Male <100 mg/dl
Female <100 mg/dl