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

Normal values range from 24 - 37%.

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

Greater than normal levels may indicate:

• Kidney failure
• Overactive thyroid (hyperthyroidism)
• Nephrotic syndrome
• Protein malnutrition

Lower than normal levels may indicate:

• Acute hepatitis
• Pregnancy
• Underactive thyroid (hypothyroidism, primary hypothyroidism, or secondary hypothyroidism)
• Use of estrogen

Abnormal results may also be due to an inherited condition of high TBG levels. Usually thyroid function is normal in these people.

Other conditions under which the test may be performed:

• Chronic thyroiditis (Hashimoto's disease)
• Drug-induced hypothyroidism
• Graves disease
• Subacute thyroiditis
• Thyrotoxic periodic paralysis
• Toxic nodular goiter

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T3RU test Overview

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T3RU test Risks

Review Date: 04/20/2010
Reviewed By: Ari S. Eckman, MD, Division of Endocrinology and Metabolism, Johns Hopkins School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)