A haemophiliac administering a factor VIII plasma transfusion at home. Haemophilia is an inherited blood disorder in which one or more of the plasma proteins (factors) needed to form a blood clot is either missing or reduced. Factor VIII deficiency is the most common type of haemophilia. Concentrated factors are freeze-dried (lyophilized), so that patients can keep a supply of factor at home and infuse themselves when needed.
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