FDA quote:
"Administering Kogenate FS to children with hemophilia A on a daily basis before a bleeding event occurs will reduce bleeding into joints and help prevent joint damage, a major cause of disability in hemophiliacs," said Dr. Jesse Goodman, director of the agency's Center for Biologics Evaluation and Research. (italics mine)
Nice bit of marketing juice for Bayer's Kogenate FS. But perhaps an underlying benefit is to signal an acknowledgement for insurers that a robust prophylactic regime should be fully embraced and properly covered.