Overactive/underactive thyroid can cause some strange symptoms, inclusive of psychosis, which is prolly why they tested your TSH when you came in for what seemed like food poisoning.
The T3 uptake number is actually how much binding protein (albumin, transthyretin, and thyroxine binding globulin) is in your blood. These proteins are made in the liver, and put your circulating thyroid hormone in temporary storage, to be freed up later by your liver. Most of your thyroid hormone is bound.
So looking at this low number, it indicates that much of your thyroid hormone is free. Which is supported by your low TSH number, which some would say its very close to being hyperthyroid.
Optimal TSH in normals (peeps not taking any hormone in a pill) is usually beteen 1 -2, with 1.5 -1.8 being the sweet spot.
I would get your thyroid tested again, since the last time you had these tests run, you were in dire straits. A thyroid test taken when you are in the throes of an extreme situation like food poisoning, can't be taken as everyday normal.
When you get your next test run, ask for a "Free T" test as well as the one for TSH (which actually measures the hormone the pituitary puts out to regulate how much thyroid hormone your thyroid needs to make).
So you'll need a Free T3, a Free T4 and a TSH.
Alternately you can order them on your own, which is what I do.
This service is not available in all states.
Here's a link to a lab service and the test you want: www.healthcheckusa.com/Thyroid-Panel-II-T4
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