Factor VIII (Antihemophilia Factor A) Does this test have other
names? Antihemophilia factor A test, AHF, factor VIII:C,
coagulation factor test What is this test? This test measures
the activity of factor VIII, a blood-clotting protein. The test
can find out whether you have hemophilia A or another clotting
disorder. Hemophilia is a rare inherited blood disorder. In this
condition, blood fails to clot normally, which puts a person at
risk of uncontrolled bleeding. Under normal circumstances,
certain proteins, including factor VIII, come together to form
blood clots and quickly stop bleeding. If you are low on factor
VIII proteins, you may have hemophilia A. Almost all people with
hemophilia A are male. Women are generally only carriers of the
gene and have a 50 percent chance of passing it on to each of
their children. But it's possible for females to develop the
disorder. Because blood-clotting proteins work together to stop
bleeding, the test may be done as part of an overall screening
for the proteins inv