bentonite flocculation test

[bĕntə-nīt′]
n.
  1. A flocculation test for rheumatoid arthritis in which sensitized bentonite particles are added to inactivated serum; if half of the particles are clumped while the other half remain in suspension, the test is positive.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.