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Doctor insights on: What Does A Low T4 Level Mean

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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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Dr. David Sneid
1,375 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...Read more


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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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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 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 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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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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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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