Another form of serological test is the precipitation test

Another form of serological test is the precipitation test...

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Another form of serological test is the precipitation test. In this test, antibodies are called precipitins.  They react with dissolved antigens and form large complexes that become visible as a fine  precipitate. Tests such as these can be performed in fluid or gel.  The complement fixation test. The complement fixation test is another application of a serological  reaction. In this test, antibodies are combined with antigens in the presence of complement, a series  of blood proteins. If the antibodies are specific for that antigen, they will react and use up (“fix”) the  complement. When a subsequent combination of blood cells and their antibodies are added to the  tube, no complement will be available and no reaction will take place. However, if the first antibodies 
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