I have been reading the following article and it has left me with questions about the best way to time my blood tests.
I am currently just starting self medicating on NDT (Thiroyd) and have arrived at a dose of one grain taken at 8am. I expect I will need to increase this over time and would like to get some guidance from blood tests. The article has made clear to me that FT3 fluctuates a great deal and the FT3 result will depend on the time the blood is taken, more than the actual amount of NDT taken. Given this, I am wondering how I should time the blood draw in order to get a useful result? I don't care much about the TSH result, not having a doctor to placate. As for the FT4 result, as T4 has a longer half life I wonder if it makes much difference if I take or don't take the NDT on the day of the blood draw.
In summary, my choices seem to be:
Don't take the NDT on the day of the blood draw. Results will then be baseline for FT3 and FT4 no matter what time of day the blood draw is done.
Take the NDT as usual on the day of the blood draw. Do the blood draw 6-8 hours afterwards. Results will show my operating levels of FT4 and FT3 at the trough for the FT3 supplied by the NDT.
Take the NDT as usual on the day of the blood draw. Do the blood draw 3-5 hours afterwards. Results will show my operating level of FT4 and FT3 at the peak for the FT3 supplied by the NDT.
So which way do you think would be most helpful as I step up the NDT and why? Opinions gratefully received.