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Doctor insights on: Tsh W Reflex Blood Test

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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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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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My cmp blood test says TSH w/reflex to f4 is 4.44 miu/l (normal range is 0.4-4.5). Do I have hypothyroidism? I have sparse eyebrows on the outer third

My cmp blood test says TSH w/reflex to f4 is 4.44 miu/l (normal range is 0.4-4.5). Do I have hypothyroidism? I have sparse eyebrows on the outer third

Not likely.: Tsh in "normal" range so not technically hypothyroid. Some would argue that TSH should actually be lower. I would repeat this in a few months. If normal again would stop worrying. If abnormal diagnosis is clear. In any case eyebrow thinning is not likely due to this tsh. ...Read more

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Should i fast for a TSH blood test?

No: Fasting for TSH is not necessary and will not change results. ...Read more