Severity Levels


A person can have mild, moderate, or severe hemophilia.  It depends on how much working clotting factor he has in his body.  This is called his clotting factor level.  It may also be called the level of deficiency or the level of severity.  The clotting factor level is shown as a percentage (%).

The standard factor level is 100%.  You can have a factor level between 60% and 200% and still be considered normal.  In a person with hemophilia, the clotting factor level is much lower than the standard.

Every person with hemophilia should know his clotting factor level!

This chart shows the three classes of severity based on the factor level.  It also shows what to expect with each level if there is no treatment.  The kinds of bleeding problems faced by someone with hemophilia usually depend on his clotting factor level. However, some people bleed more and some people bleed less than their factor levels would suggest.





Less than 1% factor level
1% to 5% factor level
6% to 25% factor level
Can bleed without injury
Can bleed with slight injury
Can bleed with bad injury, surgery, shots
May bleed one to two times per week
May bleed one time per month
May never have a bleeding problem
Usually has joint bleeding
May have joint problems
Rarely has joint problems

Severity does not change
Whether a person with hemophilia is mild, moderate, or severe does not change.  The number and type of bleeds you have may change.  This is because how healthy and active you are can affect your bleeds.  All family members with hemophilia usually have the same clotting factor level.



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