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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.

Dr. David Sneid
1,413 Doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid agent. ...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.

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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?

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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

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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.

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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

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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).

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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.

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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.

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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.

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Is it okay to sunbathe while taking synthroid (thyroxine)?

Sun sensitivity: No sunbathing while taking synthroid, (thyroxine) there are reports of sun sensitivity while taking this medication.

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What could be the effects of taking too much synthroid (thyroxine)?

What could be the effects of taking too much synthroid (thyroxine)?

Being hyper: Too much synthroid (thyroxine) can make you feel hyper, cause diarrhea, weight loss, feeling hot or hot flashes, anxiety, poor sleep, heart pounding. Please speak with your doctor if you are having these symptoms.

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Is thyroxine safe in pregnency?

Is thyroxine safe in pregnency?

Thyroid Treatment: Yes. Of course. And low or hypo thyroid in pregnancy is dangerous. Take you medication.

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Can I take q10 if I take thyroxine?

Can I take q10 if I take thyroxine?

Yes: Coenzyme q10 is presently being peddled for pretty much everything and if you believed what these people are saying you would at best be reading uncritically. Coenzyme q specifically helps a group of very rare diseases. Supplement makers are not held by law to the standards of truth that the healthtap team is. If you want to pay money to people for deceiving you, that's your business.

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In what time frame does thyroxine work?

In what time frame does thyroxine work?

Weeks: Since the thyroxine has a long duration in the body, every daily pill contributes little to the total body thyroid hormone content. As a consequence, it takes a long time (6 weeks) for thyroxine levels to reach the target level once treatment is started.

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Can I lose weight on 150 mcg thyroxine?

Depends: If you are hypothyroid, have gained weight related to hypothyroidism, and then take thyroid hormone to correct your level back to normal, you would likely lose weight. If your thyroid level is normal and you try taking thyroid hormone to lose weight, it will not work, and will likely make you gain weight, as thyroid hormone increases appetite.

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Does Synthroid (thyroxine) contain iodine?

Does Synthroid (thyroxine) contain iodine?

Thyroid hormone: Contains iodine, and synthroid (thyroxine) is thyroid hormone, so there's a very small amount of iodine in it, but not enough to cause problems, even in people who are allergic to iodine.

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Can I take Synthroid (thyroxine) with tea?

Can I take Synthroid (thyroxine) with tea?

Yes: Hi. Yep, no problem. Try to take it under the same circumstances on a regular basis.

Dr. Joseph Mathews
612 Doctors shared insights

Synthroid (Definition)

Synthroid is a thyroid agent. ...Read more


Dr. Charles Gordon
219 Doctors shared insights

Levoxyl (Definition)

Levoxyl is a thyroid agent. ...Read more