Coombs' serum

[kōōmz]
n.
  1. Serum from a rabbit or other animal previously immunized with purified human globulin to prepare antibodies directed against IgG and complement, used in the direct and indirect Coombs' tests.antihuman globulin
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.