How do I prepare the Spike-in-Control catalog # 219610 to get copies/μl?
FAQ ID -3170

Reconstitute by adding 300 μl RNase-free water per tube, resulting in a 2 x 10^10 copies/μl stock. miRNeasy Serum/Plasma Spike-In Control stock should be stored at –80°C. For large volumes, first aliquot into smaller volumes prior to long-term storage at –80°C.

Refer to page 25 of the miRNeasy Serum/Plasma Protocol Handbook for Preparation of miRNeasy Serum/Plasma Spike-In Control

http://www.qiagen.com/products/catalog/sample-technologies/rna-sample-technologies/mirna/mirneasy-serumplasma-kit#resources