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Doctor insights on: Free T3

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Dr. Jesse Krakauer
441 doctors shared insights

Liothyronine (Definition)

Liothyronine is a thyroid ...Read more


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My free T3 (liothyronine) is low but all other tests normal. What does this mean?

My free T3 (liothyronine) is low but  all other tests normal. What does this mean?

Probably nothing: Are you taking thyroid replacement? A normal TSH usually means all is ok. See a thyroidologist. ...Read more

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Thyroid was checked can you tell me if this looks ok. My TSH 0.46 Free T3 (liothyronine) 4.9 Free T4 17.9 ?

Thyroid was checked can you tell me if this looks ok.
 My TSH 0.46
Free T3 (liothyronine)  4.9
Free T4 17.9
?

Thyroid tests: Although I am not as familiar with the "normal range" in the UK (versus US), these numbers all look to be normal. However, you need to pose this question to the doctor who ordered them, since it is not clear why they were measured in the first place. ...Read more

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If T3 (liothyronine) is converted from T4 inside the cell, how can they measure the free T3 (liothyronine) in the blood test?

Similar to free T4: Both T4 and t3 (liothyronine) circulate in bound and free forms after formation in the thyroid (t4) and peripheral (t3 (liothyronine)) cells. The free t3 (liothyronine) can be measured but the results are much lower and less meaningful than free t4. ...Read more

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I had a blood test. The TSH level was 3.18, free T4 18.6 and free T3 (liothyronine) 4.3.Is it safe to try to concieve or is it harmful to baby?

I had a blood test. The TSH level was 3.18, free T4 18.6 and free T3 (liothyronine) 4.3.Is it safe to try to concieve or is it harmful to baby?

Maybe less med,,,: Your ranges are upper normal to slightly above normal. It would be a good idea to get your meds readjusted by your doctor first and then think of conceiving. Also your thyroid meds might need to be adjusted during your pregnancy. It would be a good idea to talk to your doctor and plan this out with him/her for the best result. Best of luck. ...Read more

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Is it life threatening to have a Tsh level of 0.01 Free T3 (liothyronine) 4.3 Free T4 1.8 I know TSH is not normal but how dangerous is this? Thy ultrasound today.

Is it life threatening to have a 
Tsh level of 0.01
Free T3 (liothyronine) 4.3
Free T4 1.8 I know TSH is not normal but how dangerous is this? Thy ultrasound today.

Thyroid: With a normal Free T3 (liothyronine) and FT4, I would not consider this dangerous, unless you are having symptoms of hyperthyroidism, such as increased blood pressure, rapid heart rate, sweating, anxiety, etc. The numbers are not so important, it's what your body is saying. Also, the normal T3 (liothyronine) and T4 are reassuring. ...Read more

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Free T3 (liothyronine) 3.00 free T4 1.0 would i benefit from armour thyroid? I read that TSH number is irrelevant due many factors.

Completely opposite: The TSH is the most sensitive and reliable indicator of your thyroid function (unless you have a pituitary problem). The other thyroid levels are less reliable and only helpful in people with know thyroid disorders. Taking Armour Thyroid when your thyroid works normally will do nothing except make your thyroid stop working. ...Read more

Dr. David Geffner
441 doctors shared insights

T3 (Definition)

T3 is a thyroid ...Read more