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Doctor insights on: Tsh W Reflex To Ft4 Test

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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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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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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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My TSH test results 8 months ago were 1.2 but I was tested again last week and the results of TSH - REFLEX TO FT4 are 1.850. Is this Normal?

Lab variation: Not only may the change in this number reflect a normal variation in the labs result without a change in your thyroid function it could represent normal variation of thyroid function within your own body . This might be as a result of variable absorption of any thyroid supplement you are taking or variation in disease activity if you have a disorder such as hashimoto's thyroiditis. ...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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Tsh w reflex to free t4 component results value std range 2.55 0.45-4.5 is my test results good or bad at 2.55?

Tsh w reflex to free t4
component results
value	std range
2.55         0.45-4.5   is my test results good or bad at 2.55?

Normal: The value for TSH in the scenario you decribed is normal. However, like all lab tests, interpretation must be done with attention to the bigger picture. ...Read more

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

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

I agree to a point!: Tsh slightly elevated. Your body thinks your thyroid is low. The most common cause for hypothyroidism is hashimoto's thyroiditis, which can be indentified by the presence of anti-thyroglobulin antibodies and anti-tpo antibodies. Have these tests. If positive, i would place you on thyroid immediately. I would also have my free-t3 checked as well. Some do not convert T4 to t3! ...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 (liothyronine), (liothyronine) Reverse T3 (liothyronine), (liothyronine) 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 (liothyronine) ...Read more

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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

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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: Highly unlikely. That said, your doctor should have ordered TSH and T3 (liothyronine) 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

Dr. James Chapman
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