Low TSH, Low FT4, Large Thyroid...normal??

[cawpcat]

My TSH levels have been around 0.63 for a while now so I had another test done (called "TSH, 3rd generation w/reflex to FT4"...I'm assuming this is simply FT4?) and that result was 0.67.  Both of these numbers are on the very low end of the "normal" range.  My endo says I'm fine even though I don't feel fine at all!  

It was also discovered that I have an enlarged thyroid of about twice the normal size (it's causing me no problems that I can tell) and I've had a couple of ultrasounds to keep an eye on the nodules.

I decided to get a second opinion with a highly recommended doc and I go next week.  But I wanted to come here to see if there was anyone like me or something that could offer their thoughts.  Thank you!

Kari

[goolarra]

"TSH, 3rd generation w/reflex to FT4" is an instruction to the lab.  It means:  test TSH, and if it's not within reference range, then test FT4 also.  So, your doctor isn't testing anything but TSH.  FT3 and FT4 are the actual thyroid hormones and much more important diagnostics than TSH.  I think it's an excellent idea that you are getting a second opinion.  Make sure this new doctor runs FT3 and FT4 and treats based on them rather than TSH.

Yes, I agree, what are your symptoms and are you on thyroid meds?

[TamraW]

TSH is not always reliable, as it is a pituitary, not a thyroid hormone. FT3/FT4 tell us exactly what the thyroid is doing.

What are your symptoms?

:) Tamra