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Doctor insights on: What Is Low Tsh With Reflex Ft4

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Dr. Quang Nguyen
893 doctors shared insights

Thyroid Stimulating Hormone (Definition)

A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine ...Read more


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What is meant by low TSH high free t4?

What is meant by low TSH high free t4?

Hyperthyroidism: A low TSH and high T4 is an indication of over-active thyroid (hyperthyroidism). This should be evaluated further for any potential cause and discuss treatment options with your physician. Referral to an endocrinologist may be necessary. ...Read more

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Low TSH high free t4? What is the cause?

Low TSH high free t4?  What is the cause?

Hyperthyroidism: High ft4 and low TSH are a combination usually indicating an over active thyroid. It doesn't explain the cause which will require further testing to figure out. ...Read more

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My 19 year old son has labs showing low TSH but normal free t4. What could that indicate?

My 19 year old son has labs showing low TSH but normal free t4. What could that indicate?

Depends: On the level of tsh. If TSH level remains in the range 0.2-0.6, he is at very low risk of developing hyperthyroidism. Retesting is not recommended. ...Read more

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What does low TSH 0.2 with normal free T4 mean?What is its treatment and does it need to be taken all life long?

Likely normal: Your TSH may be slightly low and may be normal for you. Do you have any symptoms? It is generally not a good idea to treat lab values. All lab 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. It is likely that you need no treatment, however, it would be prudent to follow your doctor's advice for follow up tests. ...Read more

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Very low TSH with high normal free T4. Twitching. Changed dose. How long til levels normal out? Still twitching 2 weeks later. Had basic neuro exam.

Very low TSH with high normal free T4. Twitching. Changed dose. How long til levels normal out? Still twitching 2 weeks later. Had basic neuro exam.

What did you: change the dose of? If it's thyroid replacement, it can take weeks for the level to normalize, asumming you're now on the correct dose. If it's an ANTI-thyroid drug, it can takes months to work as it only inhibits the formation of NEW thyroid hormone, not the hormone that's already been manufactured. ...Read more

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Could a low TSH but normal Free T4 mean a Pituitary problem? Or would that be more indicative of the start of Hypothyroidism?

Sounds normal: Your description is consistent with normal thyroid function, but if you are concerned, you could provide exact numbers for us to review. ...Read more

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Had total thyroidectomy 10 years ago. Currently 8 weeks pregnant, taking synthroid (thyroxine) 125mcg. Very low TSH 0.01 and high free T4 at 26 (normal 12-22). ?

Way off: That dose of thyroid needs to be reduced ASAP. Please consult with your doctor right away. I'm guessing they're doing that already if they received those test results. ...Read more

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Thyroid antibodies are high, my free T4 low, TSH & free T3 (liothyronine) in normal range, on whole thyroid yet exp 2-4lb weight fluctuation & hair loss- what next?

Thyroid antibodies are high, my free T4 low, TSH & free T3 (liothyronine) in normal range, on whole thyroid yet exp 2-4lb weight fluctuation & hair loss- what next?

Imaging: If not done so, proper imaging of the thyroid is indicated, including ultrasound and nuclear thyroid uptake scan. You may be suffering from hashimoto's thyroiditis, an immunologic condition that affects your thyroid gland causing inflammation and often leads to an underactive thyroid gland (hypothyroidism). Hashimoto's disease is the most common cause of hypothyroidism in the United States. ...Read more

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Tsh, 3rd generation w/reflex to ft4 results are 0.89. I am fatigued, overweight, vitamin deficient, and sleep 10-11 hours/night. Is this result low?

Within normal limits: Your free T4 level is within normal limits. The symptoms you described do not lend to providing a meaningful opinion without more history, physical examination and the lab data. It would be prudent to discuss the matter with your doctor. ...Read more

Dr. John Landi
252 doctors shared insights

Free T4 (Definition)

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, ...Read more