I found an interesting study that discusses dosing thyroidectomy patients according to BMI rather than weight (endocrinologists often start thyroidectomy patients at doses equivalent to their weight, so a 125lb woman would get 125mcg, etc).
The formula they propose is this:
Mcg/kg/day = .018 x BMI + 2.13
When I did the math for myself, the result was higher than any dose of thyroid hormone I've ever been given, which maybe explains why I began to develop symptoms in the years after my thyroidectomy.
I tried the formula at two different weights my body tends to gravitate towards, and these were my results:
BMI 21.5 = 142.7 mcg
BMI 20.6 = 136.1 mcg
I'm on some NDT now, but the most levothyroxine I was ever given was 125mcg, and then had my dose slowly lowered until my TSH was "normal" at 100mcg (which in retrospect was ridiculous, because I didn't have a thyroid for the TSH to stimulate!)
Anyway, I thought this might be interesting for other TT members out there. What do you guys think?