After an increase from 75mcg to 100mcg Levothyroxine, I had my 6 weeks blood test, which I fasted and avoided medication for over 24 hours for. I picked up my latest labs this morning, I'm disappointed to see that the doctor didn't run T3 as she had said she would though so I won't get all the answers I was hoping for but what was tested is as follows:
TSH 0.27 (0.35-3.5)
FT4 13 (8-21)
Using the same ranges, 2 months ago my thyroid levels were:
FT3 4.1 (3.8-6)
So, my FT4 hasn't increased at all, despite the increase in dose and decrease of TSH. The doctor wants to call me, presumably due to the below range TSH (which we all know is pretty meaningless) so no doubt wants to lower my medication again! I will point out my FT4 result if they do try to, but I would love some advice on why my FT4 hasn't increased. I wasn't aware of the avoiding medication thing for my first test though, so that's probably the cause, I take my medication at night and had the blood test at 9.30am, so it had probably been a gap of around 10-11 hours. I still have symptoms, mostly brain related but also numb fingers, so would appreciate some advice on where to go next.
The doctor seems to have run some other general blood work and my serum potassium levels have been flagged as being too low (3.4 with a range of 3.6-5). Any ideas what could cause this and whether it is an issue for anything thyroid related?
Thank you all for the wonderful advice from this forum so far!