PT  - JOURNAL ARTICLE
AU  - M H Moghadasian
AU  - J J Frohlich
AU  - C H Scudamore
TI  - Specificity of the commonly used enzymatic assay for plasma cholesterol determination
AID  - 10.1136/jcp.55.11.859
DP  - 2002 Nov 01
TA  - Journal of Clinical Pathology
PG  - 859--861
VI  - 55
IP  - 11
4099  - http://jcp.bmj.com/content/55/11/859.short
4100  - http://jcp.bmj.com/content/55/11/859.full
SO  - J Clin Pathol2002 Nov 01; 55
AB  - Aim: To assess the specificity and sensitivity of the commonly used enzymatic colorimetric test for plasma cholesterol determination. Methods: Interference with an enzymatic method for cholesterol measurement by several non-cholesterol sterols (β sitosterol, campesterol, stigmasterol, stigmastanol, desmosterol, and lathosterol) was assessed. Some of these compounds are present in plasma at higher than normal concentrations either in rare genetic disorders, such as phytosterolaemia, or after the consumption of phytosterol enriched foods. Results: The non-cholesterol sterols were detected by the assay in a linear manner. There was no competitive interference in the presence of cholesterol. Conclusions: This crossreactivity may affect the diagnosis and treatment of non-cholesterol dyslipidaemias, including phytosterolaemia and cerebrotendinous xanthomatosis. Similarly, changes in plasma lipid compositions after the consumption of phytosterol enriched foods cannot be specifically determined by this enzymatic assay. Until a more specific enzymatic assay is developed, alternative methods such as gas chromatography should be used to differentiate between cholesterol and non-cholesterol sterols.