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

Inclusion Criteria:

• Patients with diagnosis of hemophilia A, independent of age, treated with KOGENATE FS as their only source of FVIII, decision taken by the investigator to administer KOGENATE 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.

The study population will consist of patients with a diagnosis of hemophilia A. Physicians should consult the full prescribing information for KOGENATE® FS before enrolling patients and familiarize themselves with the safety information in the product package label.