discontinuation test

[dĭs′kən-tĭn′yōō-āshən]
n.
  1. A test to determine whether a drug is responsible for a reaction; a positive result is obtained if symptoms stop after use of the drug is discontinued.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.