Blood clotting factors are proteins that help in the clotting of blood.
There are several blood clotting factors present in the body such as factor I, factor II and more.
Factor VIII:
In individuals with classic hemophilia and Von Willebrand syndrome, factor VIII (antihemophilic factor) is weak or faulty.
Anti-hemophilic factor (AHF) is another name for Factor VIII.
The classic or hemophilia A condition is caused by a factor VIII deficiency. It's an X-linked recessive condition with F8 being the gene coding for factor VIII.