title: The unexpected result: fault of the laboratory? Traps in laboratory diagnostics.
abstract: In designing valid medical laboratory studies, it is imperative that the quantity of an analyte present in the body fluid in vivo, be transferred unchanged to the analytical process. Preanalytical variables acting as influence and interference factors have been described. From the practical point of view, these factors are usually not considered in quality assurance programs which only cover the analytical process.
authors.affiliation: Roche Diagnostics GmbH, Mannheim, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Zawda
mesh_terms: D019411:Clinical Laboratory Techniques / Q000592:standards*; D006801:Humans; D013048:Specimen Handling