Is there a critical step during upfront sample handling when using the PAXgene Blood RNA MDX kit?
FAQ ID -2493

Yes. After removing the supernatant by decanting from the PAXgene Blood RNA Tubes, it is sufficient to dab the rim of the tube 5–10 times with a clean paper towel. Excess drying (such as placing the tubes upside down in a rack or wiping the inner walls of the tube) is not recommended and can have negative effects on the automated procedure.