If treatment hasn’t started yet, as recommended, have thyroid baseline, in addition too, kidneys, which is pretty standard with blood tests showing the GFR, but testosterone levels, hearing, and vision too, which all were altered from my treatments. I’m on daily 150mcg levothrixine. A recent hearing test showed I lost 50% of my hearing in my left ear, most radiated side, which I sort of knew, but not the percentage, and it was recommeded I get a hearing side.

Some things may be measured during treatment, but definitely all after treatment has ended as these can be affected.

Good luck