What are the latest recommendations for measuring potentcies of high purity factor VIII concentrates?

  1. A concentrate standard should be used in lieu of plasma standards.
  2. Sample and standard concentrates should be pre-diluted in Factor VIII deficient plasma
  3. All assay buffers should contain 1% (10 mg/ml) of high purity albumin, either bovine or human.
  4. The chromogenic method is the reference method.