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Doctor insights on: Synthesis And Storage Of Thyroxine And Triiodothyronine

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Can any doc tell me what's the difference between thyroxine, thyrocalcitonin and triiodothyronine?

Can any doc tell me what's the difference between thyroxine, thyrocalcitonin and triiodothyronine?

Yes: Thyroxine also known as T4 is the main product of the thyroid gland. Triiodothyronine or t3 is also a product of the thyroid but most of it comes from the conversion of T4 in the human tissues by the enzyme deiodinase. T3 is the active and most potent form of thyroid hormone. Thyrocalcitonin or just calcitonin is unrelated to the above two, comes from the c-cells, and affects the calcium level. ...Read more

Dr. Joseph Mathews
577 doctors shared insights

Synthroid (Definition)

Synthroid is one of several commercial (non-generic) brands of levothyroxine. Levothyroxine is the most common form ...Read more


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Triiodothyronine : 0.76 ng/ml; thyroxine : 5.27 ; thyroid stimulating hormone : 1.15. Is this normal?

Triiodothyronine : 0.76 ng/ml; thyroxine : 5.27 ; thyroid stimulating hormone : 1.15. Is this normal?

Probably: In interpreting thyroid hormone levels, you have to consider several things: What is the clinical situation at the time of the lab draw- as stress, medications, even pregnancy can all effect the levels and what they should be. Every lab also has a slightly different 'normal' range depending on how they measure the hormone. Seeing the trend also helps - Are they stable, going up or down? ...Read more

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Does normal (1.01) "thyroxine (t4) free, direct, s, " normal (0.931) "tsh, " and low (67) "triiodothyronine (t3)" = Synthroid dose good? Or go up/down?

Does normal (1.01) "thyroxine (t4) free, direct, s, " normal (0.931) "tsh, " and low (67) "triiodothyronine (t3)" = Synthroid dose good? Or go up/down?

Thyroid tests: The tsh, and secondarily the ft4, are normally used to guide the dosage of levothyroxine replacement. T3 is not normally followed for this. There are a number of issues, and you would be best discussing this with your doctor. ...Read more

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On syn. 50 mcg labs are: TSH 4.45; rt3 23.3; T4 10.4; t3uptake 30; free T3 3.1; triiodothyronine T3 121. Increase synthroid? Don't sleep, fast heart.

On syn. 50 mcg labs are: TSH 4.45; rt3 23.3; T4 10.4; t3uptake 30; free T3 3.1; triiodothyronine T3 121. Increase synthroid? Don't sleep, fast heart.

See your doctor: If you are having issues with sleep and a fast pulse, you should see your family practice physician. Think of TSH like a flagpole. If it is high, you may need more thyroid hormone. If it is low, you may need less thyroid hormone. ...Read more

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I'm on 75 mcg of levothyroxine T4 can I take 75 mcg of triiodothyronine t4?

I'm on 75 mcg of levothyroxine  T4 can I take 75 mcg of triiodothyronine t4?

Depends: depends on what your body is doing to the T4 and how you are feeling. If you still have symptoms of hypothyroidism, it may be worth looking into. More info on http://drfairchild.blogspot.com/2012/12/proper-thyroid-testing.html ...Read more

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Can you please define normal level of T3 triodothyronine, T4 thyroxine, and tsh.?

Can you please define normal level of T3 triodothyronine, T4 thyroxine, and tsh.?

100-200ngm/dl,4.5-11: Tsh between 0.4 and 4.0 t4 4.5 to 11.2 micrigm per deciliter(mcg/dl) t3 is100to200nanogram per deciliter(ngm/dl). ...Read more

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Is thyroid hormone the same as thyroxine?

Is thyroid hormone the same as thyroxine?

Thyroxine is a type: The thyroid gland secretes two types of hormones: thyroxine (t4) and triiodothyronine (t3), but it produces T4 at much higher levels than t3. When treating thyroid hormone deficiency, your physician may prescribe levothyroxine (which is oral tablet of t4), liothyronine (oral formulation of t3), or combinations of such, or even dessicated (dried) pig thyroid as replacement therapy. ...Read more

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Dr. Charles Gordon
205 doctors shared insights

Levoxyl (Definition)

Levoxyl is one of several commercial (non-generic) brands of levothyroxine. Levothyroxine is the most common form ...Read more


Dr. David Sneid
1,346 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...Read more