Regional Purchasing Advisory Group - Haemophilia. Summary of progress September 1992. Details of Haemophilia and its treatment in the Oxford region, HIV/hepatitis C and haemophilia, commercial supplies of haemophilia factors, clotting factor concentrates available in the UK, evidence for the superiority of the high purity product compared with traditional products in the treatment of Factor VIII deficiency, use of prophylactic blood factors in clotting disorders, the need for national policies on haemophilia care, summary of the controlled trials.