Enzyme Immunoassays (EIA) 
Enzymes labelled conjugates were first introduced in 1966 for localization of antigens in tissues, as an alternative to fluorescent conjugates.
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assay
Radioimmunoassay (RIA) 
Besides fluorescent dyes, many other distinctive ‘labels’ also can be conjugated to antigen and antibodies. The most commonly used labels
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Detection Of Specific Antigen By Using Enzyme-Linked Immuno-Sorbent Assay (ELISA) Technique
The ELISA is an immunological technique which is used to measure either antigen or antibodies present in serum. For the
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