RT3U

Injury	Disease	Nutrition	Poison

Symptoms	Surgery	Test	Special Topic

Overview

Risks

Results

RT3U

Alternative Names:

T3RU; Resin T3 uptake; T3 resin uptake; Thyroid hormone-binding ratio

What the risks are:

Risks associated with having blood drawn are slight:

excessive bleeding
fainting or feeling lightheaded
hematoma (blood accumulating under the skin)
infection (a slight risk any time the skin is broken)
multiple punctures to locate veins

Special considerations:

Drugs that can increase RT3U values (that is, lower TBG) include anabolic steroids, heparin, phenytoin, salicylates (high dose), and warfarin.

Drugs that can decrease RT3U values (that is, raise TBG) include antithyroid agents, clofibrate, estrogen, oral contraceptives, and thiazides.

Review Date: 1/18/2006
Reviewed By: Nikheel S. Kolatkar, MD, Clinical and Research Fellow, Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital, Harvard Medical School, Boston, MA. Review provided by VeriMed Healthcare Network.

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