Thyroid Test Result Help is Needed

[Vanessa54]

My TSH level is 0.06 mIu, normal range 0.46-4.98 mIU/mL ... Thyroid Antibodies level <1.0 IU/ML, normal range 0.0-0.9 (Under result notes: it says Low Positive) but my T3 and free T4 are both normal...T3 (Total Tridothyronine) level 1.7 ng/mL, normal range 0.8-2.0 ng/mL and my T4 Free (Thyroxine Free) 1.2 NG/DL, (normal range 0.7-1.8).

My question is two part, any thoughts on this would greatly be appreciated.
1) Do you think my test results indicates hyperthyroidism?
2) Is the I-123 scan the "best" next step and is there a less costly test (my insurance covers only 80%) that would provide my doctor the same information as the I-123 scan?

Thanks for your time,  

[Mark Lupo, M.D.]

This is mild (subclinical) hyperthyroidism.  I-123 is usually the next test particularly if treatment decisions are needed immediately and the history/exam does not give a clear answer.  But w/o symptoms, observation w/ repeat TSH in 6-8 weeks would likely give the answer -- if normal/high then transient thyroiditis, if still low then Graves' OR  functioning nodule(s) -- ultrasound can be used to detect a nodule.

[Vanessa54]

Dr Lupo thank you for the quick reply, which prompt to look at my TSH lab test, which I started taking after being diagnosis with CIRS which is a autoimmune disorder.
1/12/12 TSH was 0.005
3/29/12 TSH was 0.23
4/24/13 TSH was 0.30
8/12/13 TSH was 1.27
And the most recent TSH test was taken 9/13/13 and results 0.06.
Thank you again for your input.