the smallest amount of antigen that, in the presence of specific antiserum, will fix 1 complement unit.
Farlex Partner Medical Dictionary © Farlex 2012
an·ti·gen u·nit(an'ti-jen yū'nit)
The smallest amount of antigen that, in the presence of specific antiserum, will fix one complement unit.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
The smallest quantity of antigen required to fix one unit of complement.
Medical Dictionary, © 2009 Farlex and Partners