title: Implementation of a proficiency testing for the assessment of the preanalytical phase of blood samples used for RNA based analysis.
abstract: BACKGROUND
  Although important improvements of downstream molecular in vitro diagnostics assays based on RNA from blood were made, the pre-analytical workflow is still poorly defined.
  
  
  METHODS
  We performed a multicenter study within the EU-granted SPIDIA project to investigate blood collection and shipping influence on the following RNA quality parameters: yield, purity, integrity, RT-qPCR interference and IL1B, IL8, FOS and GAPDH gene expression. Two models were designed: Exp A. Ten laboratories collected blood from an own donor into two different tubes (with or without stabilizer) and extracted RNA at two different times; Exp B. Blood was drawn from a single donor and shipped to ten laboratories in two different tubes (with or without stabilizer) for RNA extraction.
  
  
  RESULTS
  In both models and collection tubes, reliable results were obtained for purity, yield, GAPDH expression, and interferences. A substantial variation in RIN (Exp A) and in transcription levels of IL1B, IL8 and FOS (Exp B) was observed for blood collected in tube without stabilizer tubes. Overall the variability was higher among data obtained from unstabilized blood samples.
  
  
  CONCLUSIONS
  We defined the experimental setup for a larger ring trial throughout Europe. The chosen downstream analyses verified their potential, serving as adequate markers to test the quality of blood RNA.
authors.affiliation: QIAGEN GmbH, Hilden, Germany.
authors.forename: Kalle
authors.initials: K
authors.lastname: Günther
authors.forename: Francesca
authors.initials: F
authors.lastname: Malentacchi
authors.forename: Paolo
authors.initials: P
authors.lastname: Verderio
authors.forename: Sara
authors.initials: S
authors.lastname: Pizzamiglio
authors.forename: Chiara Maura
authors.initials: CM
authors.lastname: Ciniselli
authors.forename: Ales
authors.initials: A
authors.lastname: Tichopad
authors.forename: Mikael
authors.initials: M
authors.lastname: Kubista
authors.forename: Ralf
authors.initials: R
authors.lastname: Wyrich
authors.forename: Mario
authors.initials: M
authors.lastname: Pazzagli
authors.forename: Stefania
authors.initials: S
authors.lastname: Gelmini
mesh_terms: D020869:Gene Expression Profiling; D006801:Humans; D007700:Kinetics; D012313:RNA / Q000097:blood*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D012313:RNA