TEST CATALOG ORDERING & RESULTS SPECIMEN HANDLING CUSTOMER SERVICE EDUCATION & INSIGHTS
Test Catalog

Test ID: CHLE    
Cholesteryl Esters, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Establishing a diagnosis of lecithin-cholesterol acyltransferase deficiency

 

Evaluating the extent of metabolic disturbance by bile stasis or liver disease

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

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 individuals of northern Europe descent, and is associated with erythrocyte abnormalities (target cells) and decreased (20% or less) esterification of serum cholesterol. This is associated with early atherosclerosis, corneal opacification, hyperlipidemia, and mild hemolytic anemia.

 

Persons with liver disease may have impaired formation of LCAT and, therefore, an acquired LCAT deficiency and reduced cholesterol ester concentration.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

> or =18 years: 60-80% of total cholesterol

Reference values have not been established for patients who are less than 18 years of age.

Interpretation Provides information to assist in interpretation of the test results

In patients with lecithin-cholesterol acyltransferase deficiency, the concentration of unesterified cholesterol in serum may increase 2 to 5 times the normal value, resulting in a decrease in esterified serum cholesterol to 20% or less of the total serum cholesterol.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

In a severe form, cholesteryl ester storage disease can be fatal before the age of 1 year (Wolman's disease) and, in some less severe form cases, may be undetected until adulthood. This defect is caused by a deficiency of a lysosomal enzyme, acid cholesteryl ester hydrolase (also known as acid lipase). It causes accumulation of cholesteryl esters in tissues, but it has no effect on the percentage of cholesterol that circulates in esterified form 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.

 

Result can be falsely decreased in patients with elevated levels of N-acetyl-p-benzoquinone imine (NAPQI)-a metabolite of acetaminophen, N-acetylcysteine (NAC), and metamizole.

Clinical Reference Recommendations for in-depth reading of a clinical nature

1. Meikle PJ, Mundra PA, Wong G, et al: Circulating lipids are associated with alcoholic liver cirrhosis and represent potential biomarkers for risk assessment. PLoS One. 2015 Jun 24;10(6):e0130346. doi: 10.1371/journal.pone.0130346

2. Leach NV, Dronca E, Vesa SC, et al: Serum homocysteine levels, oxidative stress and cardiovascular risk in non-alcoholic steatohepatitis. Eur J Intern Med. 2014 Oct;25(8):762-767. doi: 10.1016/j.ejim.2014.09.007

3. Santamarina-Fojo S, Hoeg JM, Assmann G, Brewer B: Lecithin cholesterol acyltransferase deficiency and fish eye disease. In: Valle DL, Antonarakis S, Ballabio A, Beaudet AL, Mitchell GA. eds. The Online Metabolic and Molecular Bases of Inherited Disease. McGraw-Hill; 2019. Accessed June 8, 2021. Available at https://ommbid.mhmedical.com/content.aspx?sectionid=225539713&bookid=2709