Re: TSH w/reflex to FT4
TSH is one thyroid test.
FT4 is another thyroid test.
You indicate that "TSH w/reflex to FT4" was ordered. That means, if TSH was in normal range, they wouldn't run the FT4 test. But if your TSH was outside the normal range, they would run the FT4 test.
So, do you have two results to share, or only this one? If only one, it's likely TSH, which at .33 would be at the bottom most reference ranges. That wouldn't indicate "low thyroid" (unless the FT4 was low as well). Just the opposite; it would be on the borderline of 'high' thyroid.
Without much more information about exactly which tests were run, and whether you have any symptoms, we can't be of much more help than that.