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serum, serology, serological tests
Serum is the liquid part of the blood, normally a golden yellow color, that is left when the blood cells are removed. It is comprised of water (naturally) as well as a very high content of various proteins. These include
A serological test most commonly referw to a laboratory test done on blood serum to measure antibodies to previous infections.
Serology refers to the results of serological tests, but in normal usage the only serology doctors are speaking of happens to be that for syphillis.