Dictionary.com
definitions

Treponema pallidum hemagglutination test

n.
  1. A test for the serologic diagnosis of syphilis in which tanned sheep red blood cells are coated with the antigen of Treponema pallidum and combined with nonspecific serum antibody of an individual.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.