T3

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Triiodothyronine; T3 radioimmunoassay

100 to 200 ng/dL (nanograms per deciliter)

Greater-than-normal levels may indicate:

• hyperthyroidism (for example, Graves' disease)
• T3 thyrotoxicosis (rare)
• thyroid cancer (rare)

• chronic illness
• hypothyroidism (for example, Hashimoto's disease )
• starvation

• painless (silent) thyroiditis
• thyrotoxic periodic paralysis
• toxic nodular goiter

Review Date: 01/18/2006
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.