title: Letter to the Editor concerning Baecher et al. (Clin Chim Acta 2014;431:87-92).
authors.affiliation: Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA; Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, USA. Electronic address: mblaustein@som.umaryland.edu.
authors.forename: Mordecai P
authors.initials: MP
authors.lastname: Blaustein
mesh_terms: D002316:Cardiotonic Agents / Q000097:blood*; D006801:Humans; D010042:Ouabain / Q000097:blood*
chemical_list: D002316:Cardiotonic Agents; D010042:Ouabain
keywords: Endogenous Ouabain; Mass spectroscopy; Plasma