title: Proficiency testing in the lab as an investigative tool.
authors.affiliation: American Proficiency Institute, Traverse City, MI, USA.
authors.forename: Daniel C
authors.initials: DC
authors.lastname: Edson
authors.forename: Robin E
authors.initials: RE
authors.lastname: Stombler
mesh_terms: D007753:Laboratories / Q000592:standards*; D059021:Laboratory Proficiency Testing / Q000379:methods*; D011340:Problem Solving; D011785:Quality Assurance, Health Care; D014481:United States