Is haemophilia B less severe than haemophilia A?

Abstract excerpt

A number of observations suggest that severe factor IX deficiency (<1%) may be less clinically severe than the corresponding factor VIII deficiency: (i) Less factor consumption. There is evidence that patients with haemophilia B (HB) consume yearly less FIX for replacement therapy than patients with haemophilia (HA). Patient registries and data from various sources indicate that regular prophylaxis is implemented...

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