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A competitive ELISA for lipoprotein(a)
K H Yeo1, T A Walmsley, M C Owen
1Department of Clinical Biochemistry, Christchurch Hospital, New Zealand.
Clinica Chimica Acta; International Journal of Clinical Chemistry
|February 14, 1992
Summary
A new competitive ELISA method accurately measures lipoprotein(a) (Lp(a)) levels. This robust assay offers high sensitivity and excellent correlation with existing methods, aiding cardiovascular risk assessment.
Area of Science:
- Clinical Chemistry
- Immunology
- Biochemistry
Background:
- Lipoprotein(a) (Lp(a)) is an independent risk factor for cardiovascular disease.
- Accurate quantification of Lp(a) is crucial for assessing patient risk and guiding treatment decisions.
Purpose of the Study:
- To develop and validate a simple, robust, and sensitive competitive enzyme-linked immunosorbent assay (ELISA) for quantifying lipoprotein(a) (Lp(a)).
Main Methods:
- Utilized a commercially available polyclonal anti-Lp(a) antibody.
- Employed an IgG biotin-streptavidin-horseradish peroxidase detection system.
- Validated assay performance including sensitivity, specificity, precision, and correlation with an immunoradiometric assay (IRMA).
Main Results:
- Achieved high assay sensitivity of 0.7 ng/well (1.4 µg/L).
- Demonstrated low cross-reactivity (<0.70%) with LDL and plasminogen.
- Exhibited excellent intra-assay (4.6–5.0%) and inter-assay (9.5–10.8%) precision.
- Showed excellent correlation (r=0.98) with a commercial IRMA.
Conclusions:
- The developed competitive ELISA is a reliable, sensitive, and specific method for Lp(a) measurement.
- This assay provides a valuable tool for clinical laboratories to assess cardiovascular risk.
- The method's simplicity and robustness facilitate its widespread adoption.