flocculation test

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the formation of a precipitate or agglomerate in the form of downy tufts or floccules.
flocculation test any serologic test in which flocculation takes place; usually applied to a variant form of the precipitin reaction.

floc·cu·la·tion re·ac·tion

a form of precipitin reaction in which precipitation occurs over a narrow range of antigen:antibody ratio, owing chiefly to peculiarities of the antibody (precipitin).

flocculation test

Etymology: L, floccus, flock of wool
a serological test in which a positive result depends on the degree of flocculent precipitation produced in the material being tested. Some tests for syphilis, including the Venereal Disease Research Laboratories slide test, are flocculation tests.