当前位置： SCI文献检索 > CLINICAL BIOCHEMISTRY期刊下所有文献 > Is there an analytical or diagnostic advantage from including trisialo transferrin into the fraction of carbohydrate-deficient transferrin? Lessons from a comparison of two commercial turbidimetric immunoassays with the carbohydrate-deficient transferrin

Is there an analytical or diagnostic advantage from including trisialo transferrin into the fraction of carbohydrate-deficient transferrin? Lessons from a comparison of two commercial turbidimetric immunoassays with the carbohydrate-deficient transferrin

Abstract：

OBJECTIVES:Carbohydrate-deficient transferrin CDT has originally been defined as the sum of isotransferrins exhibiting isoelectric point values > or = 5.7 asialo, monosialo, and disialo transferrin but may also include at least in part trisialo transferrin when measured by modern commercial immunoassays. To examine the effects of divergently defining the analyte CDT, we compared two commercial assays yielding differently composed CDT fractions with a high-performance liquid chromatography HPLC assay commonly regarded as a reference method of CDT determination. METHODS:Relative CDT levels (CDT concentrations expressed as percent of total transferrin) were determined in 142 sera by (i) a turbidimetric immunoassay (ChronAlco I.D.) reportedly detecting asialo to disialo transferrin as CDT, (ii) an analogous assay (CDT Turbidimetric ImmunoAssay [TIA]) said to additionally include part of trisialo transferrin into the CDT fraction measured, and (iii) an anion-exchange HPLC method. Isotransferrins separated by the two commercial assays were also investigated by isoelectric focusing. RESULTS:Data from HPLC and isoelectric focusing indicate that the ChronAlco assay detects major parts of asialo, monosialo, and disialo transferrin as CDT while the CDT TIA yields CDT as the total of asialo, monosialo, disialo, and trisialo transferrin. When relative CDT concentrations obtained by both assays were classified as either normal or elevated according to reference ranges cited by the manufacturer and then were compared to analogously classified HPLC data, there were clearly more discrepancies between corresponding results from CDT TIA and HPLC (22%) than between ChronAlco and HPLC results (9%). CONCLUSION:Including trisialo transferrin into the CDT fraction enlarges the analytical signal and therefore slightly improves assay precision but also results in a significant number of pathologic results in samples exhibiting physiologic levels of the classical CDT components asialo to disialo transferrin. As long as the diagnostic information of the trisialo transferrin concentration is largely unknown, we strongly recommend not to include this isotransferrin into the determination of CDT.

journal_name

Clin Biochem

journal_title

Clinical biochemistry

authors

Lipkowski M,Dibbelt L,Seyfarth M

doi

10.1016/s0009-9120(00)00189-2

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

635-41

issue

8

eissn

0009-9120

issn

1873-2933

pii

S0009912000001892

journal_volume

33

pub_type

杂志文章

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