Testing
A new fully automated latex-immunoturbidimetric Lp(a) assay matches an existing commercial method with 0.9972 correlation, development study finds (Biotechnol Lett 2025)
Original title: Development of a fully automated latex-enhanced immunoturbidimetric method for quantitative serum Lp(a) measurement
This study developed and validated a fully automated latex-enhanced particle immunoturbidimetric method for quantitative serum Lp(a) measurement, aiming to address the lack of standardised Lp(a) assays that contributes to diagnostic uncertainty. Lp(a) was detected using 95 nm carboxylated latex particles coated with anti-Lp(a) antibodies, with concentration quantified by turbidity change at 600 nm on a Hitachi 7100 automatic biochemical analyzer. The method showed intra-batch precision of 1.10% CV and inter-batch precision of 1.79% CV, a detection limit of 7 mg/L, high linearity (R2 = 0.9946) across 0-1500 mg/L, minimal interference from bilirubin, fat emulsion, haemoglobin and ascorbic acid, and strong correlation with an existing commercial latex-enhanced immunoturbidimetric Lp(a) assay (R2 = 0.9972). The authors conclude this method offers rapid, accurate, fully automated Lp(a) quantification suitable for routine clinical testing.
Original abstract
Background: Lipoprotein (a) [Lp(a)] is a critical factor in cardiovascular health, composed of low-density lipoprotein-like particles bound to apolipoprotein (a). Elevated Lp(a) levels are associated with an increased risk of cardiovascular diseases (CVD), accelerating disease progression and raising CVD-related mortality. However, the lack of standardized measurement methods for Lp(a) contributes to diagnostic uncertainties in this area.
Method: A quantitative measurement method for serum Lp(a) was developed using fully automated latex-enhanced particle immunoturbidimetry, marking a significant advancement in diagnostic capabilities. Key parameters, including repeatability, stability, linearity, detection limit, interference, and method comparison, were evaluated to ensure the assay's reliability and accuracy.
Result: Lp(a) in samples was detected by carboxylated latex particles (95 nm in diameter) covalently coated with anti-Lp(a) antibodies. Lp(a) concentration was quantified by measuring the turbidity changes caused by agglutination at 600 nm. This method provides rapid, accurate, and fully automated measurements on the Hitachi 7100 automatic biochemical analyzer. With intra-batch precision CV% of 1.10% and inter-batch precision CV% of 1.79%, the method demonstrates reliable performance with Randox biochemical quality control samples. It has a detection limit of 7 mg/L and a high correlation coefficient (R2 = 0.9946) within the 0-1500 mg/L range. Minimal interference from bilirubin, fat emulsion, hemoglobin, and ascorbic acid was observed. Additionally, it shows strong correlation (R2 = 0.9972) with a commercially available latex-enhanced immunoturbidimetric Lp(a) assay reagent, confirming its comparability and clinical suitability.
Conclusion: The quantitative serum Lp(a) determination method based on latex-enhanced immunoturbidimetry offers numerous advantages. It provides rapid, accurate, and automated results, making it ideal for routine clinical testing. The method effectively measures Lp(a) in serum samples by leveraging the interaction between Lp(a) and latex particles.
Summary written by lp-a.org from the published abstract; figures as published. Page updated 18 August 2026. Methods.