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Doctor insights on: Thyroxine Vs 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 (liothyronine) 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 (liothyronine) 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. David Sneid
1,375 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...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 (liothyronine) 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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Tsh=2.11/t3 uptake=30.3/free t3=3.3/thyroxine=9.2/triiodothyronine=102.4/ everything is normal. Why do I still feel extremely tired and irritable?

Tsh=2.11/t3 uptake=30.3/free t3=3.3/thyroxine=9.2/triiodothyronine=102.4/ everything is normal. Why do I still feel extremely tired and irritable?

Reverse T3 (liothyronine): RT3 was not checked. A TSH of 2 is suspicious. More info on http://drfairchild.blogspot.com/2012/12/proper-thyroid-testing.html ...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 (thyroxine)? 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 (thyroxine)? 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 (liothyronine) triodothyronine, T4 thyroxine, and tsh.?

Can you please define normal level of T3 (liothyronine) 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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What is levoxyl (thyroxine)?

What is levoxyl (thyroxine)?

Levoxyl (thyroxine): This is a drug that is helpful for problems with the thyroid gland. There are more than one types of this medicine but there are not many differences. ...Read more

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Is 93bpm with thyroxine notmal or obermedicated?

Is 93bpm with thyroxine notmal or obermedicated?

Can't tell: 93 BPM refers to your heart rate. Under 100 is normal. You cannot assess thyroid levels by looking at heart rate. You should have thyroid blood tests of TSH and free T4 to see if you are on the correct dose. ...Read more

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What are the symptoms of underdose of thyroxine?

Hypothyroidism: When thyroid hormone is low people symptoms are highly variable from person to person. Some people do not have symptoms from mildly low thyroid hormone. Symptoms depend on degree of deficit and amount of time the hormone has been low. Here are some symptoms that are possible; fatigue, constipation, weight gain, cold intolerance and dry skin. ...Read more

Dr. Joseph Mathews
592 doctors shared insights

Synthroid (Definition)

Synthroid is a thyroid ...Read more


Dr. Charles Gordon
210 doctors shared insights

Levoxyl (Definition)

Levoxyl is a thyroid ...Read more