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Doctor insights on: What Is Normal Level Reflex Free T4

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I had a TSH REFLEX TO FREE T4 blood test done, my result is 3.70 (0.40-4.50 mIU/L), is this normal? Thank you.

I had a TSH REFLEX TO FREE T4 blood test done, my result is 3.70 (0.40-4.50 mIU/L), is this normal?   Thank you.

Thyroid function: That appears to be within the normal range, based on the laboratory standard you provided. ...Read more

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


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Blood test shows TSH w/ reflex to FT4 is 13.62 (high) & Free T4 is 1.1 (normal). How would you describe what these results mean?

Blood test shows TSH w/ reflex to FT4 is 13.62 (high) & Free T4 is 1.1 (normal). How would you describe what these results mean?

Thyroid tests: 26F US had TSH 13.6 and Ft4 1.1. Asks: How could you describe what these results mean? ANS: Need 2 know lot more about U which ur Drs already knows so better to ask them. Such as 1. U on BCP? 2. Why was test done? 3. Hx of thyroid problems n past? 4. Taking thyroid meds? 5. Pregnant? As TSH is high, u did not give normal lab range for FT4 but it seems lowest range of normal. Hypothyroid? ...Read more

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TSH reflex free T4 test = 2.51 (normal range 0.35-4.50). I've read hyperthyroidism still possible if TSH normal. Do I need another test?

TSH reflex free T4 test = 2.51 (normal range 0.35-4.50).  I've read hyperthyroidism still possible if TSH normal.  Do I need another test?

TSH: Highly unlikely. That said, your doctor should have ordered TSH and T3 as well as T4. Please go back to him/her or if you are not satisfied have a friend or family refer you to a better doctor. ...Read more

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My TSH with reflex to free T4 and T3 came out to a range of 1.0 . Is that normal ? Been feeling horrific since I gave birth 5 months ago .

My TSH with reflex to free T4 and T3 came out to a range of 1.0 . Is that normal ? Been feeling horrific since I gave birth 5 months ago .

That's a normal TSH: Hi. That's a normal TSH, but testing TSH alone only tests dysfunction of the thyroid gland itself. You need to get a TSH AND a free T4 (i.e., NOT "reflex") to see pituitary hypothyroidism (which, btw, can occur in rare cases associated with a particularly bloody delivery). Of course many problems can make you feel horrific. Can you make milk? I don't know what is wrong, but you need further eval. ...Read more

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My t4 free is 0.70 and my tsh reflex free t4 is 29.2. What does this mean and what do I need to do?

My t4 free is 0.70 and my tsh reflex free t4 is 29.2. What does this mean and what do I need to do?

Hypothyroidism: This is diagnostic of hypothyroidism and should be treated with thyroid hormone replacement which hopefully was done by the doctor who got these labs. While without a little more history is there is the remote chance of thyroiditis, it is unlikely with a TSH in this range. While EASILY TREATABLE, hypothyroidism can be a serious and even eventually a life threatening disease. ...Read more

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My TSH w/reflex to FT4 test came back at 6.73, but my free T4 came back at 1.24. I have previous has similar results to these tests.

My TSH w/reflex to FT4 test came back at 6.73, but my free T4 came back at 1.24.  I have previous has similar results to these tests.

Mild hypothyroidism: The elevated TSH means that your pituitary gland is not happy with your thyroid level, and would like to see it higher despite the "normal" free T4 level. If you do not have any symptoms of hypothyroidism, we call this "subclinical hypothyroidism". Treatment may not be needed unless you develop symptoms or the TSH goes progressively higher. You should not start treatment based on one abnormal test ...Read more

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TSH W REFLEX FREE T4 TSH, 3RD GENERATION (0.40-4.00) uIU/ML My results are 1.10 I had this test taken. Can you explain what the results mean?

TSH W REFLEX FREE T4 
TSH, 3RD GENERATION (0.40-4.00) uIU/ML My results are 1.10 

I had this test taken. Can you explain what the results mean?

Normal, but...: THIS IS A NORMAL THYROID SCREENING TESTS. There are rare diseases thyroid that can happen with an normal normal TSH, but you would have symptoms of thyroid disease or other evidence of central hypothyroidism or thyroiditis in a "euthyroid phase," which would be rare and require much more history. If there is ongoing concern see an endocrinologist. IF YOU GENERALLY FEEL WELL GREAT, IT IS NORMAL! ...Read more

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What to do if I had a blood test done and my TSH reflex to free T4 is 4.53 .50-4.30 miu/l is that bad?

Further workup: A TSH above normal indicates that your brain is telling your thyroid it needs better thyroid function. Have your free T4, free T3, Reverse T3, thyroglobulin and TPO antibodies, Ferritin, and SHBG levels checked to ensure the thyroid and tissue utilization/conversion to active thyroid is occurring. Furthermore, these levels should be optimized...TSH 3.6, low Rev T3 ...Read more

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Dr. David Sneid
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Thyroxine (Definition)

Thyroxine is a thyroid ...Read more