ELISA is an immunological assay that is commonly used to measure antibodies, antigens, proteins, and glycoproteins in biological 

samples. Some examples of this usage include the diagnosis of HIV infection, pregnancy tests, and the measurement of cytokines or soluble receptors in cell supernatant or serum. 

The ELISA test uses enzymes that attach to antibodies in your blood in order to test for the presence of a known compound. 

This is done by mixing a sample of your blood with the compound in question on special absorbent plates. 

The test can use many different enzymes and identify many different antibodies depending on what your doctor is diagnosing. 

An Elisa is used to detect the presence of an antigen in a sample by immobilization on a plate or capture with a bound 

antigen-specific antibody. If the antigen is present, a detection antibody is added, forming a complex with the antigen. 

The Chemical connected Immunosorbent Examine (ELISA) is a biomolecular procedure