I'm asking because I'm on T3 only and I stopped the T3 for 48 hours and then had a blood test. My FT3 went down but my TSH was still low.
TSH 0.02 (0.27-4.2)
FT4 6.8 (12-22)
FT3 4.9 (3.1-6.8)
When I had a blood test when I was taking 60mcg of T3 only;
I didn't take any T3 for 24 hours before the test.
When I was on Levothyroxine;
my TSH was 2.14
and FT3 4.4
I know T3 only can give you funny blood tests but shouldn't the TSH go up after stopping the T3 for 48 hours, especially as the FT3 went down from 7.8 to 4.9?