Expires 07-2025CE marked for use as an IVD within the UK, EU member states and EEA countries. In all other territories this product can be used for research purposes only.The Ct value of this control is approximately 30 using NIBSC’s in-house assay. Different assays may yield different results and therefore each user must validate this control using their own assays. English IFU. This product will be discontinued and withdrawn from the NIBSC catalogue on Wednesday 17th July 2024.