What kits does QIAGEN offer to extract RNA from whole blood?
FAQ ID -304

Several kit options are available for this application. We recommend using the PAXgene Blood RNA System, which enables the collection, stabilization and transportation of 2.5 ml human whole blood samples, and subsequent rapid and efficient isolation of cellular RNA.

Other products for the isolation of RNA from whole human blood are the QIAamp RNA Blood Mini Kit and the RNeasy Midi Kit for processing up to 1.5 ml and 10 ml human whole blood, respectively.