The purity and integrity of RNA after extraction from a biosample like blood are critical for both downstream analysis and development of on-chip diagnostics. We report for the first time on a fully centrifugally automated solidphase purification of RNA on an integrated microfluidic disc with sequential release of on-board reagents. Building on our earlier work the system successfully concatenates event-triggered valving and centrifugally controlled routing in order to collect purified RNA separately from the aqueous and organic wastes. In this article two-stage purification of RNA and sample conditioning through novel high-frequency release and hybrid event-triggered release valves is demonstrated. © 2014 IEEE.