Severity | Factor (VIII or IX) level | Clinical presentation/treatment |
---|---|---|
Mild | 5% to 40% | Occasional bleeding, usually only after severe trauma or surgery |
Moderate | 1% to 5% | Less frequent bleeding which usually follows trauma, surgery, or dental work |
Severe | <1% | Factor VIII or IX replacement is needed several times per month for traumatic, or apparently, spontaneous bleeding may be on regular prophylactic factor therapy |