General Classification of Nonisotopic Immunoassay

Immunoassay is a type of binding or ligand assay that depends on the antigen-antibody reaction. The various nonisotopic immunoassays that have been used can be divided into several groups as shown in Table 1. 

Comparison of EDso Values of Thyroxine (Tj) in Various Types of Heterologous and Homologous Enzyme Immunoassays of T4° fc 

The assay systems are divided into two groups those using labeled and those using nonlabeled methodology. In the former, the antigen-antibody reaction is detected using marker-labeled substance. In the latter, the antigen-antibody complex is detected directly without markers. 

Enzyme immunoassay Enzymes, coenzymes, enzyme modulator, etc. Enzyme activity 

Spin immunoassay Free radicals Electron spin resonance 

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