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Doctor insights on: Tsh X Reflex T4 Blood Test

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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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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 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?

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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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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Normal tsh..T4 is high .Retake blood test again still high ..Retake it again ..Now its normal. Why is that?

Normal tsh..T4 is high .Retake blood test again still high ..Retake it again ..Now its normal.  Why is that?

Lab values vary: Lab values can vary (assuming there has been no change in a patient's status nor medications). That is why lab results are "just numbers", and one should see the doctor for an interpretation of the numbers. Sometimes, 3 tests are done to see if 2 of the 3 results will match closely. A doctor may know if certain lab locations or lab companies tend to "run high" or "run low" on their results. ...Read more

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Blood test says TSH rfx on abnormal to free T4 -349829 and TSH 0.035, T4 free (direct) 1.26 what does this mean ?

Blood test says TSH rfx on abnormal to free T4 -349829 and TSH 0.035, T4 free (direct) 1.26 what does this mean ?

Hard to say...: It is difficult to say without knowing the units of measurement. For example a free T4 of 1.26 ng/l is normal but 1.26 pmol/l is quite low. A TSH value of 0.035 is defintely low and may indicate an overactive thyroid (hyperthyroidism). Consultation with your doctor or an endocrinologist is recommended. ...Read more

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I had a us of my thyroid and they found a hypoechoic nodule measuring 0.413 x 0.546cm. Blood test came back normal TSH and free T4 really nervous. ?

Please don't worry: One of the next steps is usually a fine needle aspiration biopsy, which involves using a very skinny needle to remove cells from the nodule. In my experience, most of these cells are benign, especially give the size of your nodule. However, if they are malignant or suspicious, you will need thyroid surgery. Most thyroid cancer (papillary type) can be cured. ...Read more

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What's the difference between TSH blood test and T4 free?

What's the difference between TSH blood test and T4 free?

Free T4 is a : Measure of unbound and active thyroid hormone in the blood; it goes up as your thyroid hormone level goes up, TSH measures your pituitary gland's response to your current thyroid level. Tsh goes up when your body thinks you need more thyroid hormone. ...Read more

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Dr. David Sneid
1,375 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...Read more