I have been adding T3 to T4 for 9 months. (now taking 25mcg T3 - 25mcg T4)
When on T4 alone,:-
in Oct 2009 my free T3 was 5.2 pmol/L (3.0-6.5) andT4 was 22.2 pmol/L. (10.0-23.0) SR
Adequate Thyroxine Replacement. TSH Lo 0.03 mu/L (0.35-5.50)
I am now on T3/T4 and today my Free T3 is 4.8 pmol/L (3.0-6.5) and free T4 is Lo 9.6 pmol/L (10.0-23.0) SR
(borderline free T4 probably Euthyroid)
TSH Lo 0.16 mu/L (0.35-5.50) SR
Is it because I take less T4 and the T3 goes directly into cells that the free T4 is lower?