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|linkpage =Immunology - WikiBlood
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|linktext =IMMUNOLOGY
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|sublink1 =Immunological testing - WikiBlood
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|subtext1 =IMMUNOLOGICAL TESTING
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|pagetype =Blood
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==Introduction==
 
==Introduction==
 
The radioimmunoassay (RIA) is a sensitive technique used to detect the presence of antigen in a sample using radiolabelled antibodies. Developed in the 1960's, the RIA proved a powerful tool in antigen detection, although the procedure was soon overtaken by ELISA, which utilise enzymes rather than radioactive labels. RIAs are still used today however, to measure:  
 
The radioimmunoassay (RIA) is a sensitive technique used to detect the presence of antigen in a sample using radiolabelled antibodies. Developed in the 1960's, the RIA proved a powerful tool in antigen detection, although the procedure was soon overtaken by ELISA, which utilise enzymes rather than radioactive labels. RIAs are still used today however, to measure:  
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