Question 1

hello, i have low free t4 but normal t3 tsh and all other metabolic panels. what could be causing this?

Accepted Answer

Thyroid: A low free T4 may be important but surely your doctor has discussed this with you.
If this has not happened but you feel OK, relax for a bit.
However, if you really are concerned please have your Primary doctor  refer you to an Endocrinologist.

All should go well! Please let me know.

Question 2

what is significance of low free t3 (liothyronine) and free t4 & normal tsh?

Accepted Answer

Not sure if any.: The TSH is normal so it might be a variation of normal or euthyroid.  It also might be a developing thyroid condition, but there would be symptoms, like fatigue.  It would be wise to see your doctor to follow up.

Question 3

normal tsh but low free t4? whats th3 difference between these 2 test? do i have a thyroid problem?

Accepted Answer

Reproducible?: Hi. Is the lab profile with normal TSH and low free T4 reproducible? The labs should be repeated. If the free T4 was just below the normal range, and on repeating it's in the normal range, then your thyroid function is normal. If free T4 is significantly low and TSH is normal, that suggests pituitary disease affecting the pituitary cells that make TSH. Good luck!

Question 4

what does a normal tsh but low free t4 level mean? can you have an underactive thyroid with a low t4 alone? tsh 2.45 t4 7

Accepted Answer

Thyroid function: When TSH is normal and T4 is low this is called subclinical hypothyroidism. It is not treated unless if you have symptoms.
Also if TSH &gt; 10 some would start treatment. Hope that helps answer your question.

Question 5

hi! i got lab work from my doctor. both the t4 total (7.0) and free t4 (1.5) i think are normal. tsh is 0.47 and t3 is 73, which i think are both low--should i see an endocrinologist with these results? do i need ct or mri to check anything further?

Accepted Answer

Context needed: Clinical context as to why you are having thyroid tests done, follow up, symptoms, etc and test dynamics if you had similar tests in the past and how are they trending before speculating as to where to go with above numbers. An endocrinologist should help clarify if not already involved. Imaging may be considered, more information will be needed.

Question 6

hypo symptoms but endo will not treat as free t4 normal&tsh ranges 2.8 to 4.4. hashimitos confirmed many time by excess tpo/ab. could treating help?

Accepted Answer

Not deficient: Hashimotos can go through three phases, 1. uncommonly it may cause hyperthyroidism in an early phase of the disease, 2. followed by normal thyroid function and the 3. long phase of hypothyroidism. At this time you do not thyroid deficiency and taking thyroid medication is unlikely to be helpful.

Question 7

what does normal tsh, but high free t4 mean?

Accepted Answer

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.

Question 8

tsh levels are these normal? tsh- 3rd generation- 1.04 miu/l , then another one was 0.63 miu/l. tsh w/free t4 rfx 1.50 miu/l. are these normal levels?

Accepted Answer

Probably: Most labs include a reference range (or normal range) in their reports.  While there can be some variation from one lab to another, almost all labs would consider TSH values between 0.5 to 3.0 to be normal.  All three of your levels fall in this range, and so would be considered normal.

Question 9

normal tsh, high free t4 mild elevation , what might be the cause ?

Accepted Answer

Repeat the labs: Hi. In all likelihood, it's a lab error or some trivial explanation. Repeat the labs to see if the lab profile is reproducible. Among the very rare possibilities that it's real would be thyroid hormone resistance, a condition wherein a mutation in a subunit of the thyroid hormone receptor is present (these people are euthyroid), or a pituitary adenoma that makes thyroid hormone (these are hyperthy

Question 10

is it concerning for someone with hashimotos taking synthroid of 0.5 to have a normal tsh-3.0 and slightly elevated free t4-1.8?

Accepted Answer

: At our laboratory 1.8 is still within normal range.  In my opinion your synthroid dose appears appropriate.

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Doctor answers about:

Low free t4 normal tsh

A member asked:

Hello, i have low free t4 but normal t3 tsh and all other metabolic panels. what could be causing this?

A member asked:

What is significance of low free t3 (liothyronine) and free t4 & normal tsh?

A member asked:

Normal tsh but low free t4? whats th3 difference between these 2 test? do i have a thyroid problem?

A member asked:

What does a normal tsh but low free t4 level mean? can you have an underactive thyroid with a low t4 alone? tsh 2.45 t4 7

A member asked:

Hi! i got lab work from my doctor. both the t4 total (7.0) and free t4 (1.5) i think are normal. tsh is 0.47 and t3 is 73, which i think are both low--should i see an endocrinologist with these results? do i need ct or mri to check anything further?

A member asked:

Hypo symptoms but endo will not treat as free t4 normal&tsh ranges 2.8 to 4.4. hashimitos confirmed many time by excess tpo/ab. could treating help?

A member asked:

What does normal tsh, but high free t4 mean?

A member asked:

Tsh levels are these normal? tsh- 3rd generation- 1.04 miu/l , then another one was 0.63 miu/l. tsh w/free t4 rfx 1.50 miu/l. are these normal levels?

A member asked:

Normal tsh, high free t4 mild elevation , what might be the cause ?

A member asked:

Is it concerning for someone with hashimotos taking synthroid of 0.5 to have a normal tsh-3.0 and slightly elevated free t4-1.8?

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