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Doctor insights on: Free T4

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Dr. Louis Gallia
269 Doctors shared insights

Free T4 (Overview)

T4 is the main hormone produced by the thyroid gland total T4 is amount in blood stream attached to albumin, as well as 'free' in blood stream. Free T4 is just the amount free in serum, not attached to albumin.


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What does abnormal to free T4 349829 means?

What does abnormal to free T4 349829 means?

That number: Is outside of the possible range of results for that test, so something is wrong somewhere. Check w/your doctor. ...Read more

Dr. Louis Gallia
269 Doctors shared insights

Free T4 (Overview)

T4 is the main hormone produced by the thyroid gland total T4 is amount in blood stream attached to albumin, as well as 'free' in blood stream. Free T4 is just the amount free in serum, not attached to albumin.


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33 yr M 6'2 185 pounds. High TSH levels but normal free T4, whst exactly does this mean?

33 yr M 6'2 185 pounds. High TSH levels but normal free T4, whst exactly does this mean?

Subclinical hypothyr: Hi. That is commonly seen, now that we screen so well for disorders of thyroid function. It's called subclinical hypothyroidism, meaning that with extra push from the pituitary (TSH), the remaining thyroid tissue is able to make thyroid hormone in the normal range. You should start taking thyroid hormone now, and not wait till your metabolic tank is empty. Good luck! ...Read more

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Can someone define free T4 51.1 and suppressed TSH please?

Can someone define free T4 51.1 and suppressed TSH please?

Something is: Incorrect, as free T4 measurements don't go up that high. If free T4 is above normal and tsp is suppressed you need to be evaluated (and probably treated) for hyperthyroidism. Check w/your doctor and see if there was some sort of clerical error in the free T4 result. ...Read more

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Could you have high total T4 levels but have normal free T4 levels?

Could you have high total T4 levels but have normal free T4 levels?

Yes: Total T4 reflects T4 bound to proteins in your blood. Free T4 measures the amount of T4 that is free and not bound so that it can be metabolically active. Thus women taking Estrogens (as in bc pills) have elevated levels of thyroid binding globulin and elevated total t4, but normal free t4. ...Read more

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I have normal levels lab work except free T4 high. I had thyroid scan it showed hyperthyroidism not graves. Why isn't it showing in my lab work?

I have normal levels lab work except free T4 high. I had thyroid scan it showed hyperthyroidism not graves. Why isn't it showing in my lab work?

Confusion: A thyroid scan cannot diagnose hyperthyroidism, only lab tests and doctor can. Graves' disease is a type of hyperthyroidism. Free T4 is usually not as accurate for diagnosis as tsh. Thyroid "uptake" may have been done with scan and can be elevated for several reasons other than hyperthyroidism, such as thyroid inflammation. See your doctor and/or an endocrinologist. ...Read more

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I had a us of my thyroid and they found a hypoechoic nodule measuring 0.413 x 0.546cm. Blood test came back normal TSH and free T4 really nervous.?

Please don't worry: One of the next steps is usually a fine needle aspiration biopsy, which involves using a very skinny needle to remove cells from the nodule. In my experience, most of these cells are benign, especially give the size of your nodule. However, if they are malignant or suspicious, you will need thyroid surgery. Most thyroid cancer (papillary type) can be cured. ...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

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I've been having waves that go through my body and when it gets to my head I feel like I'm going to pass out. No pain. My free T4 is high. Not heart.

I've been having waves that go through my body and when it gets to my head I feel like I'm going to pass out. No pain. My free T4 is high. Not heart.

Could be: All related to your thyroid. Hard to say without knowing how high and what the rest of the panel is and what your vitals are. Are you sleeping?? Eating well?! Keep working with your doctor. ...Read more

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What does normal tsh, but high free T4 mean?

Recheck the labs: Normally, if the ft4 is high, either due to hyperthyroidism or taking too much synthroid, (thyroxine) your TSH is low. Mistakes in labs can occur, so first have them rechecked. Rarely, you can have a pituitary tumor that makes TSH and causes hyperthyroidism, giving you both increased TSH and ft4. But this is rare, and more likely there is a simple explanation. ...Read more

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What do "free t4" & "anti-microsound" mean?

Thyroid tests: A "free T4" level is a measure of the biologically active amount of thyroid hormone in the blood, circulating "free" (rather than attached to blood proteins). Anti-microsomal or anti-peroxidase antibodies, are antibodies circulating in the blood stream that are associated with having autoimmune thyroid disease. ...Read more

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What does abnormal to free T4 349829 means?

That number: Is outside of the possible range of results for that test, so something is wrong somewhere. Check w/your doctor. ...Read more

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What is the definition or description of: free t4?

What is the definition or description of: free t4?

See below: T4 is the main hormone produced by the thyroid gland total T4 is amount in blood stream attached to albumin, as well as 'free' in blood stream. Free T4 is just the amount free in serum, not attached to albumin. ...Read more

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Could you have high total T4 levels but have normal free T4 levels?

Yes: Total T4 reflects T4 bound to proteins in your blood. Free T4 measures the amount of T4 that is free and not bound so that it can be metabolically active. Thus women taking Estrogens (as in bc pills) have elevated levels of thyroid binding globulin and elevated total t4, but normal free t4. ...Read more

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Can high free T4 level cause lightheadedness?

Hyperthyroidism: Hyperthyroidism can lead to dizziness. Find out the cause for the hyperthyroidism and get it treated accordingly. ...Read more

Dr. David Sneid
1,414 Doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid agent. ...Read more