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Doctor insights on: What Does A Low T4 Level Mean

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What does it mean if T4 (7.23) level is norm but ft4 (2.15) is elevated in graves disease while on mmi. If dose is increased, will T4 drop too low?

What does it mean if T4 (7.23) level is norm but ft4 (2.15) is elevated in graves disease while on mmi. If dose is increased, will T4 drop too low?

Graves medications: It can be tricky to adjust the dose of Methimazole in someone with graves disease. Too much Methimazole can make you hypothyroid. The ft4 is more reliable than the total t4. The TSH will probably stay suppressed unless your thyroid has been normal for a long time. Another factor is your symptoms. If you feel ok, the slightly elevated ft4 may be ok. ...Read more

Dr. David Sneid
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Thyroxine (Definition)

Thyroxine is a thyroid agent. ...Read more


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My TSH 3rd generation level came back at 9.490. MY T4 was normal and T3 (liothyronine) was low. Taking 200 mcg. What do these numbers mean?

My TSH 3rd generation level came back at 9.490. MY T4 was normal and T3 (liothyronine) was low. Taking 200 mcg. What do these numbers mean?

Still hypothyroid: Not sure how long u have been on thyroid replacement, but if been on 200mcg daily over 6-8 weeks, likely require increase dose. If u have just had u'r medication adjusted the. Repeat TSH usually done in 6 wks; the numbers show that u'r body is still in hypothyroid state and that u'r thyroid gland is making less and less hormone or the T4 is not being converted to T3, (liothyronine) so thyroid medicine needed ...Read more

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My TSH levels are normal, my T4 is almost low? What could this mean? I have 3 hyperechoic nodules on a diffused thyroid. Size. 09 to 1.5 CM.

"almost" low: Means normal, so stop worrying about your lab values. Your nodules, on the other hand, need someone to evaluate your clinical parameters and ultrasound carefully and decide whether you need to have a thyroid biopsy. ...Read more

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MY TSH level is 0.02 (Low?) and T4 is 0.66 (Low?) What does this mean. I have been on synthroid (thyroxine) 50 MCG for hypothyroid for 3 months

MY TSH level is 0.02 (Low?) and T4 is 0.66 (Low?) What does this mean. I have been on synthroid (thyroxine) 50 MCG for hypothyroid for 3 months

See below: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, given your TSH level you are on a sufficient dose of medication. Please do keep your follow-up appointments for monitoring the treatment. ...Read more

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I am diagnosed with low TSH and normal T3 and T4 level...What does it mean? Please suggest me treatment...

I am diagnosed with low TSH and normal T3 and T4 level...What does it mean? Please suggest me treatment...

T3 and T4: A low TSH should not affect your thyroid glands!
If you are having a problem please see an Endocrinologist. Should not be necessary. ...Read more

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Can Lamotrigine (Lamictal) affect TSH levels? Also, what do low TSH mean (if T3 (liothyronine) and T4 are normal)?

Can Lamotrigine (Lamictal) affect TSH levels? Also, what do low TSH mean (if T3 (liothyronine) and T4 are normal)?

Not alot: Thyroid interaction is not common with Lamictal, however as with all medications for each individual that can be a possibility. As to your low TSH that is usually a resonse to elevated T3, (liothyronine) T4. Remember that there can be variations in your thyroid measurements from one time to another. How do you feel. Do you have thyoid symptoms: cold, tired, fatigued, skin or nail changes? ...Read more

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What does the following mean: Heterogeneous nodular of the thyroid gland with increased vascularity. As well as low T4 and TSH levels?

What does the following mean: Heterogeneous nodular of the thyroid gland with increased vascularity. As well as low T4 and TSH levels?

Plan: You have to discuss all this result with doctor, who knows your history, symptoms and all medical problems. Most likely you need the treatment for thyroid dysfunction, what depend heavily on numbers in blood work. ...Read more

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I'm hypothyroid, I take eltroxin. Tsh and T4 levels are normal but free T3 (liothyronine) is a bit low. What that mean?

I'm hypothyroid, I take eltroxin. Tsh and T4 levels are normal but free T3 (liothyronine) is a bit low. What that mean?

Likely normal: All lab results need to be interpreted in the clinical context and the doctor who ordered the test is usually in the best position to do that. You may wish to discuss the matter with your doctor at the next visit. ...Read more

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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

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

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 > 10 some would start treatment. Hope that helps answer your question. ...Read more

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Does a very low level TSH hormone mean hypo - or hyperthyroidism? T3 (liothyronine) is normal range, T4 is at the low level borderline.

Does a very low level TSH hormone mean hypo - or hyperthyroidism? T3 (liothyronine) is normal range, T4 is at the low level borderline.

Low TSH: Generally indicates an excess in thyroid hormone. That may be chronic w/hyperthyroidism -- or temporary w/thyroid inflammation. See you doctor. If you're already on thyroid replacement, the dose is too high. If you're on t3, (liothyronine) get off of it as it can be dangerous and doesn't work well as chronic replacement. Use brand name T4 only. ...Read more

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Could a low TSH (.28) & normal T3 (liothyronine) & T4 levels mean a Pituitary issue? Or is that more typical of hypothyroidism? Would high Chloride (111) effect it?

Could a low TSH (.28) & normal T3 (liothyronine) & T4 levels mean a Pituitary issue? Or is that more typical of hypothyroidism? Would high Chloride (111) effect it?

Means pituitary is: A TSH of 0.28 with normal free T4 and free T3 (liothyronine) likely means the pituitary is working properly. A TSH of 0.1-0.4 is lower than the reference range, which means about 2.5% of normal people have a TSH or 0.1-0.4. Thus, one hopes she is normal. Her endocrinologist can follow and recheck her levels in 4-6 weeks to confirm that her levels are stable (TSH not dropping lower; T4 or T3 (liothyronine) not above normal). ...Read more

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My 12 year old dayghter's T3 level is 208 and her T4 is normal. Her glucose is high, her vitamin d level is low, her platelets are high and she has sickle cell trait. What does this all mean?

My 12 year old dayghter's T3 level is 208 and her T4 is normal. Her glucose is high, her vitamin d level is low, her platelets are high and she has sickle cell trait. What does this all mean?

Not enough details: Hard to tell what's happening from just numbers. A doctor can evaluate the patient along with the test results, and take into consideration what meds the patient takes, what symptoms she has, why the tests were ordered, what the "units" of measurement were, what the "normal values" of the tests were, etc... For starters, this patient may need a TSH test, and some vitamin d supplements. ...Read more

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What does a low T4 free test mean?

What does a low T4 free test mean?

Low free T4: If a patient is not currently on certain types of thyroid medication, it means low thyroid function. You would need more labwork done to confirm the diagnoses. ...Read more

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What does high T4 level mean?

It can mean: An elevated level of thyroid hormone, either due to hyperthyroidism or thyroid inflammation. It can be falsely elevated by estrogen therapy. Other thyroid tests are more reliable. The T3 (liothyronine) you're receiving is potentially dangerous and should not be taken. It can not me measured in the blood and has potential toxicity. Use brand name T4 only if replacement is required, . ...Read more

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Is a T4 free level of 1.24 high or low?

Looks normal: Assays for ft4 differ, but this appears to be about normal. Check with your doctor. ...Read more

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What does it mean when my T4 level is 12.3?

What does it mean when my T4 level is 12.3?

Nothing: Alone nothing it all depend what your TSH was ...Read more

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What could cause my T4 levels to be very low?

What could cause my T4 levels to be very low?

Depends: Depending on the type of assay - free T4 or an index (that might be low because of binding problems unrelated to thyroid function). Most of the time a true low T4 is due to an underactive thyroid. Rarely the pituitary that controls the thyroid may be low.
See a thyroid doctor. ...Read more

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What does it mean when you have a low T4 reading?

What does it mean when you have a low T4 reading?

Possible hypthyroid: Or low tbg.
Ask you doctor what your TSH is if the test was done for possible hypothyroidism. A normal TSH and low T4 may mean nothing.
Find a thyroidologist through the american thyroid association. ...Read more

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High TSH levels but normal T4 levels, I don't understand what this means?

High TSH levels but normal T4 levels, I don't understand what this means?

Early hypothyroidism: If the elevated TSH persists, it generally indicates early hypothyroidism, which can easily be diagnosed and treated by your doctor. ...Read more

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I have a high TSH but normal T4 levels, what does this mean?

I have a high TSH but normal T4 levels, what does this mean?

Hypothyroidism: The TSH test is10 times more sensitive for the diagnosis of hypothyroidism that the t4. The TSH is reported on a log scale so that small changes in the TSH value are caused by relatively big changes in the blood level. This is a reflection of the pituitary being extremely sensitive to change in the T3 (liothyronine) level if you have symptoms it would be wise to seek treatment. ...Read more