Implementation of a proficiency testing for the assessment of the preanalytical phase of blood samples used for RNA based analysis

article i nfo 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 col- lection and shipping influence on the following RNA quality parameters: yield, purity, integrity, RT-qPCR in- terference 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 labo- ratories 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 expres- sion, 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 down- stream analyses verified their potential, serving as adequate markers to test the quality of blood RNA.