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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

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Dr. Melissa Young
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Dr. David Sneid
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Thyroxine (Definition)

Thyroxine is a thyroid ...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.

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.

Normal function: Hi. You have normal thyroid function. Free T4 is allowed to be "almost low" - another way to express that is "normal". You have normal thyroid function, and your thyroid nodules are not hyperfunctioning. Your nodule(s) 10 mm or greater in diameter should be evaluated with fine needle aspiration biopsy, however, to see if there is cancer. Good luck! ...Read more

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

Can Lamotrigine (Lamictal) affect TSH levels?

Also, what do low TSH mean (if T3 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, 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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I'm hypothyroid , i take eltroxin .Tsh and T4 levels are normal but free T3 is a bit low.What that mean?

I'm hypothyroid , i take eltroxin .Tsh and T4 levels are normal but free T3 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 is normal range, T4 is at the low level borderline.

Does a very low level TSH hormone mean hypo - or hyperthyroidism? T3 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, 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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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 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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What does high T4 level mean?

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 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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