The "free thyroxine index".
D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D007475:Ion Exchange Resins / Q000378:metabolism; D008722:Methods; D009401:Nephrosis / Q000097:blood; D011247:Pregnancy; D013959:Thyroid Diseases / Q000097:blood; D013960:Thyroid Function Tests; D013974:Thyroxine / Q000097:blood*
D007457:Iodine Radioisotopes; D007475:Ion Exchange Resins; D013974:Thyroxine