title: The measurement of calcium and potassium in clinical laboratories in the United States, 1971--1978.
mesh_terms: D000704:Analysis of Variance; D002118:Calcium / Q000097:blood*; D002624:Chemistry, Clinical / Q000379:methods / Q000592:standards*; D010338:Pathology, Clinical / Q000592:standards; D011188:Potassium / Q000097:blood*; D011786:Quality Control; D012016:Reference Values; D014481:United States
chemical_list: D011188:Potassium; D002118:Calcium