Thyroid Cancer / Nodules & Hyperthyroidism Expert Forum
Hyperthyroid and Levothyroxine
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Questions in the Thyroid forum are answered by Mark Lupo, MD. Topics covered include Goiter, Graves Disease, Hyperthyroid, Parathyroid/Calcium Problems, Thyroid Cancer, Thyroid Nodules/Cysts, Thyroiditis, Thyroid & Pregnancy, Thyroid Stimulating Hormone (TSH), Thyroid Tests, and Thyroid Surgery.

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Hyperthyroid and Levothyroxine

Dear Dr. Lupo:

I had RAI for my Graves' disease and a month later my blood work came back as follows: TSH: < 0.01 and T3: (ng/dL): 69 and FT4: 0.7. My doctor has prescribed 75MCG of Levothyroxine (Levoxy) daily. Why would my doctor prescribe hormone replacement when my thyroid remains overactive? Isn't it best to wait until my thyroid becomes underactive?
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97953_tn?1193367871
your doctor is doing the tight thing - the T3 and T4 are lowish - it takes longer for the TSH to begin to rise.  If the doc waits until the TSH is high, then the hypothyroidism is often very severe.
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Mark Lupo, M.D.Blank
Thyroid & Endocrine Center of Florida
Sarasota, FL
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