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What could be a reason for high levels of Free T4 and normal TSH and T3 levels?

I just got my blood test done, and my results came in today.

TSH: 1.82 mlU/L
T3, Free: 3.7 pg/mL
Free T4 (Ref): 1.6

Last time, my Free T4 was 1.5, and according to the range the doctor uses, both values are in the abnormal range. I am a 20-year-old male.

I still have to hear back about my doctor's opinion on my results, but I was wondering if this is something to be worried about and what might be the cause of this?
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Avatar universal
Those are unusual ranges.  Never seen Free T4 and Free T3 ranges like those.  Usually the ranges ar more like .8-1.8 for FT4 and 2.3-4.2 for FT3.  What lab did those tests?

Everyone can have different thyroid levels at which they feel normal.  Even though your FT4 is at top of that range, your FT3 is only at 41% of its range.  FT3 is the more important since it largely regulates metabolism.  

Even more important than test results are symptoms, since they reflect the amount of thyroid activity throughout your body.      Your symptoms do not clearly identify a thyroid problem; however, I think it would be a good idea to ask your doctor for an ultrasound of your thyroid gland.  It is also a good idea to know your Vitamin D, B12 and ferritin levels.  

If you can get the ultrasound and those tests, then we will be happy to review those with you.  
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Avatar universal
Test results vary from lab to lab, along with associated reference ranges.  So for us to best assess those results, please post the reference ranges, as shown on the lab report. Even more important, please tell us about any symptoms you have.
Helpful - 0
The reference range for T4 free is 0.8-1.4 ng/dL  . I got 1.6 ng/dL for my second lab and 1.5 a few months back. TSH and T3 seem within range with the range being .4-4.5 miU/L and 3-4.7 pg/mL.

Sometimes, I get red hot ears, and I have been having anxiety symptoms. I also have some mild pain in throat area, and sometimes I have slight discomfort when drinking water.
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