What is a NIBSC cytokine standard?

The NIBSC is an Official Medicines Control Laboratory (OMCL), associated with the World Health Organization (WHO). They produce and maintain more than 98% of international biological standards used as primary reference materials to ensure the safety and potency of biological medicines. They offer several reference cytokines (standards) with approved activities. These are used to calibrate assays for the accurate determination of cytokine activity.