Testing for lipoprotein(a) concentration and apolipoprotein(a) phenotypes: method standardization and pediatric...

Area of Science:

• Cardiovascular Research
• Pediatric Medicine
• Clinical Chemistry

Background:

• Elevated lipoprotein(a) (Lp[a]) is a recognized independent risk factor for atherosclerosis, heart disease, and stroke in adults.
• In children, high Lp[a] levels are also linked to an increased risk of symptomatic thromboembolism.

Purpose of the Study:

• To describe methods for evaluating Lp[a] phenotypes.
• To correlate Lp[a] phenotypes with plasma concentrations.
• To establish age-dependent reference values for Lp[a] in pediatric populations.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) was used to measure Lp[a] plasma concentrations.
• Agarose gel electrophoresis and anti-apolipoprotein(a) immunoblotting were employed for phenotype analysis.
• Study included 184 pediatric patients with thromboembolic events and 150 healthy controls.

Main Results:

• Mean Lp[a] concentration was 3 mg/dL in infants (1-12 months) and 10 mg/dL in older children (1.2-18 years) in the control group.
• Established upper percentile cut-offs for Lp[a] concentrations across different pediatric age groups.
• Provided age-specific reference ranges for Lp[a] in children.

Conclusions:

• Age-dependent reference values for plasma Lp[a] concentrations in children have been established.
• These reference values will facilitate the harmonization of international pediatric studies.
• The findings will aid in further evaluating the role of elevated Lp[a] in childhood vascular diseases.