Direct hemagglutination assays

Definition

Direct hemagglutination assays are laboratory techniques used to detect the presence of antibodies or antigens in a sample by observing the agglutination (clumping) of red blood cells. This method is commonly employed to diagnose infections and monitor immune responses.

5 Must Know Facts For Your Next Test

1. Direct hemagglutination assays involve the direct interaction between antigens on red blood cells and specific antibodies.
2. They are often used to detect antibodies against viruses such as influenza, measles, and mumps.
3. The assay can be quantitative, providing information about the concentration of antibodies in a sample.
4. A positive result is indicated by visible clumping or agglutination of red blood cells in the test well.
5. The sensitivity and specificity of direct hemagglutination assays depend on the quality of the reagents and proper execution of the protocol.

Related terms

Hemagglutination Inhibition Assay: A technique where an antigen-antibody reaction prevents the agglutination of red blood cells.

Indirect Hemagglutination Assay: An assay that detects antibodies using red blood cells coated with antigens.

Antigen-Antibody Complex:

The complex formed when an antibody binds to its specific antigen.