Measurement of free thyroxine in serum.
D000704:Analysis of Variance; D005260:Female; D006801:Humans; D006980:Hyperthyroidism / Q000097:blood; D007037:Hypothyroidism / Q000097:blood; D011247:Pregnancy; D013974:Thyroxine / Q000097:blood*
D013974:Thyroxine