Elimination of false-positive results in a luminex assay for pneumococcal antibodies
Related Experiment Video
Updated: Jun 18, 2026
Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
Published on: September 25, 2014
Jerry W Pickering1, Matthew T Larson, Thomas B Martins
1ARUP Institute for Clinical and Experimental Pathology, 500 Chipeta Way, Salt Lake City, UT 84108, USA. jerry.pickering@aruplab.com
Abstract:
In our 14-valent Luminex assay for pneumococcal antibodies, we identified two groups of sera that caused false-positive results. The first group bound nonspecifically to the Luminex microspheres. The second group reacted specifically with bovine serum albumin (BSA). We describe here methods that eliminated the false-positive reactivity of both groups.
Insights
False-positive results in pneumococcal antibody testing were identified. Methods were developed to eliminate nonspecific binding and bovine serum albumin (BSA) cross-reactivity in Luminex assays, improving accuracy.
Area of Science:
- Immunology
- Biotechnology
Background:
- Luminex assays are widely used for detecting antibodies.
- Accurate detection of pneumococcal antibodies is crucial for vaccine efficacy studies.
Purpose of the Study:
- To identify and resolve sources of false-positive results in a 14-valent Luminex assay for pneumococcal antibodies.
- To improve the reliability and accuracy of pneumococcal antibody measurements.
Main Methods:
- Characterization of sera exhibiting false-positive reactivity in the Luminex assay.
- Development and implementation of blocking strategies to prevent nonspecific microsphere binding.
- Optimization of assay conditions to mitigate bovine serum albumin (BSA)-specific cross-reactivity.
Main Results:
- Two distinct groups of sera causing false-positive signals were identified.
- Nonspecific binding to Luminex microspheres was a significant source of error.
- Specific reactivity against bovine serum albumin (BSA) also contributed to false positives.
Conclusions:
- The developed methods effectively eliminated false-positive reactivity in the pneumococcal antibody Luminex assay.
- These improvements enhance the precision of antibody quantification in immunological studies.
- The findings support the use of optimized Luminex assays for reliable pneumococcal antibody assessment.
