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4 bytes added ,  14:25, 4 September 2008
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=Drawbacks=
 
=Drawbacks=
 
Although the RIA is a very sensitive test, and therefore widely-used, there are disadvantages to its use:
 
Although the RIA is a very sensitive test, and therefore widely-used, there are disadvantages to its use:
*The radioactive substances being used
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*The substances being used are radioactive
 
*Gamma radiation needs special counting equipment for detection
 
*Gamma radiation needs special counting equipment for detection
 
*Iodine is naturally concentrated in the thyroid gland, whether radioactive or not, and incorporated into thyroxine
 
*Iodine is naturally concentrated in the thyroid gland, whether radioactive or not, and incorporated into thyroxine
 
Consequently, ELISA has largely overtaken RIA as a preferred diagnostic tool
 
Consequently, ELISA has largely overtaken RIA as a preferred diagnostic tool
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