The aim of this international prospective, non-interventional post-marketing surveillance study is to obtain data on treatment procedures, long-term safety and efficacy and patient acceptance of KOGENATE Bayer in treatment of patients with haemophilia A under daily-life treatment conditions.

Inclusion Criteria:

• Patients with diagnosis of haemophilia A, treated with KOGENATE Bayer/FS as their only source of FVIII, decision taken by the investigator to administer KOGENATE Bayer/FS. For pretreated patients with more than 100 exposure days an inhibitor assessment within three months prior to enrollment should be available; for pretreated patients with less than 100 exposure days an inhibitor assessment at baseline should be available.

Exclusion Criteria:

• Exclusion criteria must be read in conjunction with the local product information.

Haemophilia A patients, no specific study population