title: Components of variance in laboratory quality control.
mesh_terms: D000328:Adult; D000704:Analysis of Variance / Q000379:methods*; D001782:Blood Donors; D001800:Blood Specimen Collection / Q000379:methods; D002624:Chemistry, Clinical / Q000592:standards*; D006801:Humans; D007753:Laboratories / Q000592:standards*; D008297:Male; D008875:Middle Aged; D011786:Quality Control / Q000379:methods*; D013974:Thyroxine / Q000097:blood; D013997:Time Factors
chemical_list: D013974:Thyroxine