underactive thyroid

[lynndee59]

tsh 0.76 tpo <3.0 is this indicative of underactive thyroid

[zuzanah]

I think you should ask for ft3 and ft4 as well. But your TSH and antibodies look okay.

[DreamNaut]

Possibly an overactive one.. a high TSH level indicates underactive thyroid, while low TSH levels indicate an overactive one. These are questions you should discuss with your doctor. The symptoms you are experiencing must be accounted for as well.

Good luck and God Bless

[Barb135]

Neither of those figures is indicative of underactive thyroid.  TSH is a pituitary hormone, which is produced to stimulate the thyroid into producing thyroid hormones.  Low TSH often, but not always, indicates over active thyroid.  

"Thyroid peroxidase (TPO) is an enzyme made in the thyroid gland that is important in the production of thyroid hormone. TPO is found in thyroid follicle cells where it converts the thyroid hormone T4 to T3.

Thyroid peroxidase test is a test that measures the level of an antibody that is directed against thyroid peroxidase (TPO).

Autoantibodies to thyroid peroxidase (TPOAb) are produced within the body. The presence of TPOAb in the blood reflects a prior attack on the thyroid tissue by the body's immune system."

Your TPO indicates that you do not have antibodies; however, in order to be sure you don't have an autoimmune thyroid disease, you would also need to get Thyroglobulin Antibodies (TGab) tested, since some people only have TPOab, some have only TGab and some have both.  

Are those the only 2 tests you had done?  How about a Free T3 and Free T4 test?