title: Regulation of proficiency testing under the March 14 rule.
authors.affiliation: Health Care Financing Administration, Baltimore, MD 20217.
authors.forename: C
authors.initials: C
authors.lastname: Hinkel
mesh_terms: D002624:Chemistry, Clinical / Q000331:legislation & jurisprudence / Q000592:standards*; D006801:Humans; D007753:Laboratories / Q000331:legislation & jurisprudence / Q000592:standards*; D008004:Licensure / Q000331:legislation & jurisprudence*; D011786:Quality Control