thyroid suppression test

n.
  1. A test of thyroid function used to diagnose difficult cases of hyperthyroidism in which triiodothyronine is administered for a period of 7 to 10 days.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.