title: Lab proficiency tests mandated.
authors.forename: E S
authors.initials: ES
authors.lastname: Ray
mesh_terms: D002568:Certification / Q000331:legislation & jurisprudence*; D005161:Facility Regulation and Control / Q000331:legislation & jurisprudence*; D006801:Humans; D007753:Laboratories / Q000331:legislation & jurisprudence*; D009722:Nurse Practitioners; D014481:United States