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HelpTest Code CHLE Cholesteryl Esters, Serum
Reporting Name
Cholesteryl Esters, SUseful For
Establishing a diagnosis of lecithin-cholesterol acyltransferase deficiency
Evaluating the extent of metabolic disturbance by bile stasis or liver disease
Method Name
Enzymatic Colorimetric
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumSpecimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into plastic vial. Send refrigerated.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 7 days | |
| Frozen | 60 days | ||
| Ambient | 24 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | Reject |
Reference Values
≥18 years: 60-80% of total cholesterol
Reference values have not been established for patients who are less than 18 years of age.
Day(s) Performed
Monday through Friday
CPT Code Information
84311
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CHLE | Cholesteryl Esters, S | 21197-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CHLES | Cholesteryl Esters, S | 21197-9 |
Clinical Information
Cholesterol in the blood serum is normally 60% to 80% esterified with fatty acids, largely as a result of the action of the enzyme lecithin-cholesterol acyltransferase (LCAT), which circulates in the blood in association with the high-density lipoproteins.
Familial deficiency of LCAT is uncommon, usually occurring in individuals of northern European descent, and is associated with erythrocyte abnormalities (target cells) and decreased (20% or less) esterification of serum cholesterol. LCAT deficiency is associated with early atherosclerosis, corneal opacification, hyperlipidemia, and mild hemolytic anemia. In persons who are deficient in LCAT, a much smaller percentage of the serum cholesterol is esterified. Persons who have a familial deficiency of LCAT have only 20% or less of serum cholesterol esterified. In association with a deficiency of LCAT, the concentration of unesterified cholesterol in the serum may increase 2 to 5 times the normal value and the concentration of lecithin may also increase.
Persons with liver disease may have impaired formation of LCAT and, therefore an acquired LCAT deficiency and reduced cholesterol ester.
Interpretation
Persons who have a familial deficiency of lecithin-cholesterol acyltransferase have only 20% or less of serum cholesterol esterified.
Cautions
Cholesteryl ester storage disease exists as a severe form that is fatal before the age of 1 year (Wolman's disease) and as a subtle form that in some cases has been undetected until adulthood. This disease is caused by a deficiency of a lysosomal enzyme, acid cholesteryl ester hydrolase (also known as acid lipase). Its deficiency causes accumulation of cholesteryl esters in tissues, but it has no effect on the percentage of esterified cholesterol that circulates in the blood serum. Detection of the defect requires careful evaluation of the cholesteryl ester hydrolase activity and cholesteryl ester content of leukocytes, cultured fibroblasts, and liver biopsy specimens.
Method Description
Free cholesterol reacts with cholesterol oxidase to generate hydrogen peroxide which reacts with 3,5-dimethoxy-N-(2-hydroxy-3-sulfopropyl) aniline sodium (DAOS) and 4-aminoantipyrene to produce a blue pigment. The product is proportional to the serum free cholesterol concentration.(Fujifilm Free Cholesterol E. Fujifilm Wako Pure Chemical Corporation; 12/2021)