Subclinical Hyperthyroidism

[Alio_Ditty]

I wanted to have some lab ran because my days between menstrual cycle was 20 days for 2 months in a row. Has since returned to normal. TSH is 0 (0.3-4.8), T3 is 119 (76-181), T4 is 1.2 (0.7-1.6), Thyroid Antibodies 262 (<35). Subclinical hyperthyroidism? No symptoms other than stalled weight loss. Only possible significant history is intentional weight loss over the past year of around 60lbs by healthy diet and cardio. Previous TSH 3 years ago was WNL. Again, I am asymptomatic.

We are looking at possible conception in the near future and am wanting this evaluated. In my area, the soonest appointment for endocrinology is in August.

1) What is the next lab or diagnostic exam that my ENT may recommend at my upcoming appointment? My research discovered a Radioactive Iodine Thyroid Scan and Uptake Test. Is that correct?

2) Could my weight loss and diet/exercise have caused this?

[goolarra]

Elevated TPOab usually indicates Hashi's.  While Hashi's ends up being hypo, it can be hyper in early stages or can swing back and forth from hypo to hyper.  TPOab can be somewhat elevated with other autoimmune diseases as well, like Graves' disease.  And, though it sounds a contradiction in terms, you can have both Hashi's and Graves' antibodies.

Your FT4 looks really good.  It's at 56% of range, which is just above the 50% guideline.  Unfortunately, your doctor ran total T3, which is not nearly as useful as FREE T3 (FT3).  TT3 is 41% of range, and the target for T3 is top half of range.  So that's a little low.  

I should have asked if you were on thyroid meds.  Also, have you had a thyroid ultrasound?  

[Alio_Ditty]

Thyroid Peroxidase Antibodies: 262 (<35)

[goolarra]

Which antibodies are 262?