Proficiency Testing (PT) Sample definition
Proficiency Testing (PT) Sample means a performance evaluation sample whose true value is unknown to the laboratory and provided by a State Laboratory-approved Vendor to test whether the laboratory can produce analytical results within the specified acceptance criteria.
Proficiency Testing (PT) Sample means a sample submitted to a laboratory by the DEQ or other designated agent for the purpose of assessing the ability of the laboratory to correctly analyze samples using an approved method.