Quality of Life Study of Helixate NexGen

Inclusion Criteria: * Haemophilia A patient * Severely (\<1%) and moderately (1-5%) affected * On treatment with Helixate NexGen * Ability to read and understand study materials (patient information and data protection form, patient-related questionnaires) * Signed data protection form; if patient is \<18 years of age, legal guardian must also give written consent by signing the data protection form Exclusion Criteria: * Presence of inhibitors * Abuse of recreational drugs or alcohol interfering with the every-day-life in the opinion of the physician * Advanced stage human immunodeficiency virus (HIV) infection (CD4 cell counts \<200/cmm, multi-drug resistance, presence of AIDS related signs or symptoms) * Symptomatic liver disease (cirrhosis, ascites, esophageal varices) * Concomitant or planned interferon therapy * Malignancies on or off treatment