Thyroid question

Hi everyone,
About 6 months ago, during routine bw that my clinic requires every year, I found out that I have subclinical hyperthyroidism (TSH 0.26, but normal T3 and T4). My general doctor is very interested in thyroid issues, so she re-ran the tests a few weeks ago for me and they came back the same... TSH 0.27 and normal T3 and T4.

She agrees that no treatment is needed, but says that a thyroid ultrasound could give more information as to what type of hyperthyroidism it is or something like that... I can't exactly remember her reasoning. She tends to like tests.

So I have a question for those of you with some sort of thyroid issue... is a thyroid u/s really necessary?

Thanks for your help!
Hadas

Me & DH: 39
Married at 32 and TTC right away
2/07: IUI #1 (Clomid only) BFP (No more hb at 9 weeks; D&C)
Through rest of 2007: Multiple IUI's (Clomid or Femara): all BFN
3/08: IVF #1 FSH: 11.6 (highest ever recorded for me) MDL protocol; BFP/chemical
10/08: IVF #2: BFP! DD born 7/09
5/10: Uterine polyp removal
8/10: FET #1: BFP/Chemical
11/10: IVF #3: Retrieval only; transfer postponed due to thin lining
1/11: FET #2: BFN
3/11: FET #3: BFN
12/11: Uh oh... FSH 16
2/12 Low dose IVF #4 with Clomid: 3 follies all empty
4/12 FSH 11.7
4/12 Low dose IVF #5 Injectables: BFN