Agglutination Test
Agglutination Test - Related Videos
07:06
Particle Agglutination Method for Poliovirus Identification
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2011
A recently developed novel particle agglutination (PA) assay utilizing virus receptor molecule allowed a rapid and easy identification of poliovirus (PV). In this article, we will show the procedure for the PA assay for PV identification.
09:11
Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
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Cited by 32 •
2014
Latex agglutination testing is a simple, rapid and inexpensive method for serotyping Streptococcus pneumoniae, and has also been widely applied in diagnostic microbiology. This manuscript describes the in-house production of latex agglutination reagents, quality control procedures and the application of this technique to pneumococcal serotyping.
02:45
Blood Transfusion and Agglutination
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2021
Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient. History The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...
05:59
Determining the Reactivity and Titre of Serum using a Haemagglutination Assay
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Cited by 3 •
2010
Haemagglutination is a form of agglutination where antibodies bind to red blood cells. Red blood cells are both readily available and the results are readily observable using the naked eye. This video demonstrates the steps involved in a haemagglutination assay, interpreting the results and determining the titre.
07:58
Quantifying Fibrillar Collagen Organization with Curvelet Transform-Based Tools
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Cited by 10 •
2020
Here, we present a protocol to use a curvelet transform-based, open-source MATLAB software tool for quantifying fibrillar collagen organization in the extracellular matrix of both normal and diseased tissues. This tool can be applied to images with collagen fibers or other types of line-like structures.
FAQs
Antibodies attach to matching antigens displayed on separate particles, linking those particles into larger complexes. Once enough cross-links form, the complexes aggregate rather than remaining evenly dispersed, creating visible clumping or a characteristic pattern. This physical change converts a molecular recognition event into an observable laboratory result that can indicate antigen presence or immune reactivity.
The amount of antigen affects how effectively antibodies can form cross-links between particles. A suitable concentration supports extensive complex formation and visible aggregation, whereas an unsuitable concentration can weaken or obscure the expected pattern. For that reason, antigen concentration must be considered when interpreting a result, particularly when a reaction appears unexpectedly weak or absent.
Cross-reactivity can cause antibodies to interact with related but non-target antigens, producing clumping that does not represent the intended target. Controls help assess whether the observed pattern reflects a specific reaction rather than nonspecific aggregation or an experimental problem. Using appropriate controls is therefore important when agglutination supports serological diagnosis, pathogen identification, or other biological conclusions.
The particulate target may consist of cells, bacteria, latex beads, or other particles carrying the relevant antigen or antibody. The chosen material determines what biological interaction the assay can reveal and how the result appears visually. This flexibility allows the same general testing principle to be adapted for blood-group typing, pathogen-related testing, or assessment of immune responses.
A test brings the relevant antibody and antigen together on a particulate surface, then the mixture is examined for visible aggregation or a recognizable pattern. Interpretation requires comparison with appropriate controls and attention to antigen concentration and possible cross-reactivity. The result is most useful when the observed clumping is considered alongside the biological question the assay was designed to address.
These assays are useful when a rapid, simple visual readout can support identification or screening. Applications described for agglutination include blood-group typing, pathogen identification, serological diagnosis, and measurement of immune reactivity. They can reveal biological recognition without requiring a complex readout, although their findings still require careful interpretation because reaction conditions and specificity influence the outcome.