Agglutination Assay
Agglutination Assay - 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.
08:12
The TUNEL Assay
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2023
One of the hallmarks of apoptosis is the nuclear DNA fragmentation by nucleases. These enzymes are activated by caspases, the family of proteins that execute the cell death program. TUNEL assay is a method that takes advantage of this feature to detect apoptotic cells. In this assay, an enzyme called terminal deoxynucleotidyl transferase catalyzes the addition of dUTP nucleotides to the free 3’ ends of fragmented DNA. By using dUTPs that are labeled with chemical tags that can produce...
FAQs
Repeated epitopes allow one antibody to bind multiple particulate targets and connect them into a larger network. This cross-linking increases the physical size of the reaction product, making the result visible as clumping or suitable for instrumental measurement. Without repeated binding sites, the interaction may not produce aggregates large enough to support a clear assay readout.
The assay format depends on which binding partner is supplied in the reagent and which is sought in the sample. A sample antibody can bind repeated antigenic targets on particles, while a sample antigen can interact with specific antibodies attached to particulate materials. This flexibility supports both antibody detection and antigen detection in infection-related testing.
Reagent specificity, sample quality, and appropriate controls are central to reliable interpretation. Specific reagents help distinguish the intended antibody or antigen from unrelated material, while poor-quality samples can complicate observation or measurement. Controls provide a reference for deciding whether observed clumping reflects the target reaction rather than an unclear assay background.
Direct observation uses visible clumping as the readout, whereas instrumental formats quantify or detect the reaction through measurement rather than visual inspection alone. Both approaches depend on the formation of particulate aggregates, but instrumental measurement can provide a more standardized way to record the result. The selected readout should match the laboratory workflow and interpretation requirements.
A typical workflow brings the sample into contact with particulate material carrying the relevant antigen or antibody, allows the specific binding interaction to occur, and then examines the mixture for aggregation. The result may be read visually or measured with an instrument. Reagent specificity, sample quality, and controls must be considered when assigning meaning to the observed outcome.
These assays are useful when researchers need a relatively simple and rapid approach for pathogen identification, antibody detection, or serologic diagnosis. They can reveal infection-related biomarkers through a visible or measurable reaction and therefore support screening as well as clinical laboratory workflows. Their value is greatest when the reagents and controls appropriately support the intended interpretation.
Blood-group testing applies the same particle-clumping readout to a different immunological question. Specific binding reactions involving blood-cell surfaces can produce observable aggregation that helps distinguish blood-group characteristics. This application shows that the method is not limited to pathogen-related biomarkers and can also support routine immunology-based classification in laboratory settings.