title: Diagnostic value of clinical assays' two-step "immunoextraction" RIA for free thyroxin in nonthyroidal illnesses.
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D011863:Radioimmunoassay / Q000379:methods; D013223:Statistics as Topic; D013974:Thyroxine / Q000097:blood*
chemical_list: D013974:Thyroxine