high T4

My latest test results:

T3 uptake 29.8 Normal

T4  13.2 H  (4.5-12.5 norm)

TSH 2.58 norm

My question is why would my T4 be high if my TSH is within normal?  I have been on 75mcg synthroid for 5 weeks and will not be getting another test for 3 more weeks.  I still feel I have no strength and shaky.  All other tests are in the middle range of the norm.

[kitty9309]

Is this a total or free t4? It looks like total. Free t4 is a better test.
If it is a total, estrogen can increase it. That would be estrogen from birth control or any other supplemental estrogen.
The TSH would do well to come down a bit. It may continue to come down by the next blood test.
Ask for a free t4for the next time.
T3 uptake is also an outdated test.

Is this an endo ordering these?

[ifupleze]

Just my PCP.  It is T4 Thyroxine.  What is the difference in T4 and free T4?  I am not on any estrogen or other hormone replacement.  Thanks for your help.

[kitty9309]

The free t4 is the actual amount of thyroxine circulating in your blood.
The t4 total is the free t4 and the amount bound to a protein and doesn't reflect the actual amount available for your body to use.

Here is a link to Thyroid Manager with a chart for reasons why total t4 may be elevated:

http://www.thyroidmanager.org/chapter6/Ch-6b-5.htm

Have you seen an endo at all?