T3 : Normal Values & Results (Triiodothyronine, T3 radioimmunoassay)

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T3

Alternate Names : Triiodothyronine, T3 radioimmunoassay

Normal Values

The range for normal values is 100 to 200 ng/dL (nanograms per deciliter).

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

What do Abnormal Results Mean?

Greater than normal levels may indicate:

High levels of a protein that carries T3 in the blood (may occur in pregnancy, with use of birth control pills or estrogen, liver disease, or as part of an inherited condition)
Hyperthyroidism (for example, Graves disease)
T3 thyrotoxicosis (rare)
Thyroid cancer (rare)

Lower than normal levels may be due to:

Long-term illness
Hypothyroidism (for example, Hashimoto's disease)
Starvation

Other conditions under which the test may be performed:

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Review Date : 9/2/2008
Reviewed By : A.D.A.M. Editorial Team: David Zieve, MD, MHA, Greg Juhn, MTPW, David R. Eltz. Previously reviewed by Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Review provided by VeriMed Healthcare Network (6/17/2008).

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