Is double centrifugation required for plasma processing?
No. However, a second centrifugation step helps remove traces of buffy coat that may be accidentally transferred when aspirating plasma after the first centrifugation step.
The PAXgene Blood ccfDNA Tube is a plastic, closed, evacuated tube for the collection, anticoagulation, transport and storage of human whole blood samples and the stabilization of ccfDNA. When the tube is used in conjunction with the QIAsymphony PAXgene Blood ccfDNA Kit, the QIAGEN QIAamp MinElute ccfDNA Kit or the QIAamp Circulating Nucleic Acid Kit, high-quality ccfDNA can be isolated for use in downstream analytical assays.
The PAXgene Blood ccfDNA System consists of a blood collection tube (PAXgene Blood ccfDNA Tube) and a ccfDNA purification kit for the QIAsymphony (QIAsymphony PAXgene Blood ccfDNA Kit).