Reposted due to lack of response:
I am hoping that someone can offer an explanation for a fluctuating FT3 level, despite good levels of FT4.
Could it be solely down to conversion?
When I was taking 237.5mcg of Levo I was tempted to raise the dose but then figured that as my FT3 level at that dose was not too dissimilar to when I was taking 212.5mcg, I would revert to the lower dose and give it a bit more time.
As you can see below, my FT3 level was initially higher at the lower dose (May 2022) but then dropped 20% (July 2022):
November 2021 - 212.5mcg Levothyroxine:
TSH - <0.01 (0.27 - 4.20)
FT4 - 16.00 (9.00 - 19.00) 70% of range
FT3 - 5.00 (2.4 - 6.0) 72.22% of range
January 2022 - 225mcg Levothyroxine:
TSH - <0.01 (0.27 - 4.20)
FT4 - 17.10 (9.00 - 19.00) 81% of range
FT3 - 4.90 (2.4 - 6.0) 69.44% of range
March 2022 - 237.5mcg Levothyroxine:
TSH - <0.01 (0.27 - 4.20)
FT4 - 19.00 (9.00 - 19.00) 100% of range
FT3 - 5.20 (2.4 - 6.0) 77.78% of range
May 2022 - 212.5mcg Levothyroxine:
TSH - <0.01 (0.27 - 4.20)
FT4 - 16.20 (9.00 - 19.00) 72% of range
FT3 - 5.60 (2.4 - 6.0) 88.89% of range
July 2022 - 212.5mcg Levothyroxine:
TSH - <0.01 (0.27 - 4.20)
FT4 - 16.80 (9.00 - 19.00) 78% of range
FT3 - 4.50 (2.4 - 6.0) 58.33% of range