Biological Variation of Lipoprotein(a) in a Diabetic Population. Analysis of the Causes and Clinical Implications
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Cristina Hernández
Abstract
The aims of the present study were to evaluate the biological variability of lipoprotein(a) (Lp(a)) in diabetic patients and to investigate the biological sources of this variability. Lp(a) was measured by ELISA in four serum specimens collected in 3-month intervals from 70 patients. The other parameters analyzed were: total cholesterol, high density lipoprotein-cholesterol (HDL-C), low density lipoprotein-cholesterol (LDL-C), triglycerides, glucose, HbA and albumin excretion rate. The overall biological within-subject variance (CVb) was 31.7%, and it was inversely correlated with Lp(a) serum levels. According to the initial ranges of Lp(a) serum levels (<15, 15–30 and >30mg/dl) the CVb were 42.3%, 24.1% and 23.7%, respectively. In multivariate analysis the total intra-individual coefficient of variation (CVt) of triglycerides and the CVt of the albumin excretion rate (AER) were independently associated with the CVb of Lp(a) (R2 =0.54). The intra-individual biological variation of Lp(a) produced a misclassification of 20% of diabetic patients for cardiovascular risk attributable to this lipoprotein. In conclusion, the higher biological variability of Lp(a) observed in diabetic patients suggests that a single determination could be inaccurate to assess the cardiovascular risk associated with this lipoprotein, at least in those patients in whom serum levels are near the cut-off considered as risk for cardiovascular disease (>30 mg/dl). Finally, triglycerides and AER are the main factors influencing Lp(a) serum levels in the diabetic population.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- SIBioC 2003 35th National Congress of the Italian Society of Clinical Biochemistry and Clinical Molecular Biology, Florence, Italy, 14–17 October 2003
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- Factors Affecting Intestinal Absorption of Highly Lipophilic Food Microconstituents (Fat-Soluble Vitamins, Carotenoids and Phytosterols)
- Protective Effects of Antioxidant Micronutrients (Vitamin E, Zinc and Selenium) in Type 2 Diabetes Mellitus
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- The Effect of Selenium on Immune Functions of J774.1 Cells
- Effects of Vitamin B12 and Folate Deficiencies on DNA Methylation and Carcinogenesis in Rat Liver
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