title: Letter: Evaluation of Harleco CO2 apparatus: comparison with natelson microgasometer and "SMA 6-60" methods for determining serum bicarbonate (CO2).
mesh_terms: D001639:Bicarbonates / Q000097:blood*; D001784:Blood Gas Analysis / Q000295:instrumentation*; D006801:Humans; D008365:Manometry; D008722:Methods
chemical_list: D001639:Bicarbonates