I am considering having the t3 test dne privately as my doctor requested it up the lab did not do it due to a normal tsh. My ft4 is 11.6 (10-20) and dropping, so wondering if my issue is conversion? I need the t3 result to see if this is the case. My question is the test is a finger prick test, is this accurate and under what conditions should I test? Ie. time of day etc .. Thank you.