Norgen’s cf-DNA/cf-RNA Preservative Tubes are closed, evacuated plastic tubes for the collection and the preservation of cf-DNA, ct-DNA, cf-RNA and CTCs in human whole blood samples during storage and shipping. The tubes preserve cf-DNA/cf-RNA for 30 days at ambient temperature using a non-formaldehyde, proprietary preservative agent while preventing both hemolysis and cell lysis and the release of gDNA and accumulation of apoptotic ladder in plasma. In combination with the Norgen’s cf-DNA and cf-RNA Purification technology, high-quality cf-nucleic acid can be isolated for use in any downstream analytical assays