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Doctor insights on: Half Life Of T3 Thyroid

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If my tsh low, t3 (liothyronine) and t4 is normal, is it hypo or hyper thyroidism? Should I take iodine? Ultra sound is normal, without pathology.

If my tsh low, t3 (liothyronine) and t4 is normal, is it hypo or hyper thyroidism? Should I take iodine? Ultra sound is normal, without pathology.

Hypothyroid: The answer to this question depends on what your exact levels are and what type of symptoms you have. "Subclinical Hypothyroidsim" sometimes presents in the manner you describe. ...Read more

Dr. Barbara Lavi
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more


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TSH=0.4 uiu/ml,T3=1.2,T4=7.2,how is my thyroid ?

TSH=0.4 uiu/ml,T3=1.2,T4=7.2,how is my thyroid ?

Abnormal : Not knowing what the normal value for TSH is for the lab where your blood was done , it is hard to say . However most labs the normal for TSH is 1-5 . Your is below one . I suggest you get a Thyroid evaluation , which may include a Repeat thyroid function tests snd TSH and an Ultra sound of the Thyroid snd proceed from there . ...Read more

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Which is better for under active thyroid. Syntheroid or t3 (liothyronine)?

Which is better for under active thyroid. Syntheroid or t3 (liothyronine)?

Synthroid (thyroxine): Synthroid or some form of levothyroxine is most commonly used. If you are taking it and are concerned that it is not working properly after several months you can ask your doctor to check T3 (liothyronine), (liothyronine) but usually with an adequate dose of T4 the body synthesizes plenty of T3 (liothyronine). ...Read more

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What does it mean if most of my thyroid levels are in the low normal range and my T3 (liothyronine) is low?

What does it mean if most of my thyroid levels are in the low normal range and my T3 (liothyronine) is low?

Nothing: T3 (liothyronine) is important inside the cell, in the blood, the measurement is usually meaningless. If the other thyroid tests (free T4 and tsh) are normal, ignore the t3, (liothyronine) as it's a waste of your blood and money. ...Read more

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What causes an elevated reverse T3 (liothyronine) level but the other thyroid levels are normal thyroid??? My reverse t3 (liothyronine) was 35

What causes an elevated reverse T3 (liothyronine) level but the other thyroid levels are normal thyroid??? My reverse t3 (liothyronine) was 35

Many causes: First, I am impressed your doctor tested reverse T3 as few doctors ever check it. There are many possible causes of increased reverse T3 including high cortisol (from chronic stress, emotional or physical), inflammatory conditions, injuries and infections like Lyme disease (which is surprisingly common and often undiagnosed). See http://www.stopthethyroidmadness.com/reverse-t3/ for more info. ...Read more

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What does it mean to have a total T3 (liothyronine) and reverse T3 (liothyronine) in thyroid diagnosis?

What does it mean to have a total T3 (liothyronine) and reverse T3 (liothyronine) in thyroid diagnosis?

Reverse T3- liver pr: Normally yourt4 is deioidonated in yout liver to T3 (liothyronine) to produce the active thyroid hormone. However the presence of high cortisol, high estrogen or high Insulin impairs this process. Instead of making t3 (liothyronine), (liothyronine) your liver makes reverse t3 (liothyronine). The TSH and ft4 are nl b/c the thyroid itself works fine, it is the liver that is not ok. ...Read more

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Came off wrong T3 (liothyronine) meds and did thyroid tests weeks later - everything normal. Have no appetite except for jello and yoghurt now - help?

Came off wrong T3 (liothyronine) meds and did thyroid tests weeks later - everything normal. Have no appetite except for jello and yoghurt now - help?

Unclear question: Hi. T4 is the normal thyroid med (aka levothyroxine, l-thyroxine, Synthroid, etc). T3 (liothyronine) is a different thyroid med sometimes used with T4. There is desiccated porcine thyroid extract from pig thyroids. There aren't different T3 (liothyronine) meds. If you came off T3 (liothyronine) and were still on T4 with normal labs, that's expected. Using T3 (liothyronine) is not necessary; the body makes it's own T3 (liothyronine) from the T4 you take. ...Read more

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I don't understand why I need less levothyroxine after removal of my ENTIRE thyroid. My dr lowered my dosage. Does the body make more T3/4 elsewhere?

I don't understand why I need less levothyroxine  after removal of my ENTIRE thyroid. My dr lowered my dosage.  Does the body make more T3/4 elsewhere?

Adjust the dose: You do need levothyroxine after removal of thyroid gland. Usually if the lab test shows very low TSH then we do need to decrease the dose so that TSH comes up to acceptable level. Sometimes patients need less dose with advancing age or after losing weight. T4 is solely a product of the thyroid gland, whereas T3 is a product of the thyroid and other tissues where it is formed by deiodination of T4 ...Read more

Dr. Jesse Krakauer
441 doctors shared insights

Liothyronine (Definition)

Liothyronine is a thyroid ...Read more


Dr. David Geffner
441 doctors shared insights

T3 (Definition)

T3 is a thyroid ...Read more